Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31aaf7f1527a744…

MALICIOUS

PDF

104.0 KB Created: 2021-04-01 23:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2ae8ad7889b0183608fbd8cd904a6de3 SHA-1: 974890e1210ccc08d6fbc4ce04cb3c0e1c683f01 SHA-256: f31aaf7f1527a744ef7fcce718d82e23b7de920c028e42e14eb60daf527c4283
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://zajinet.ru/wix?keyword=us+constitution+emoji+express', is particularly suspicious and likely serves as a lure or distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/wix?keyword=us+constitution+emoji+express PDF link annotation
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/1907606.pdfIn PDF document text
    • https://falojabuvo.weebly.com/uploads/1/3/4/7/134774067/kubuxegudosebawaxob.pdfIn PDF document text
    • http://besiditiduw.22web.org/jeripikigatawawu.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/9599707.pdfIn PDF document text
    • https://telewebejuta.weebly.com/uploads/1/3/1/6/131607630/mugezuzufevofa-mowigotalado-detumorufoxuvak.pdfIn PDF document text
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/semaragunaji_bekijilad_visojosazi_bakutil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/039a7f46-e658-4a0a-9afa-d9698f6c71e3/51467207711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03c8f4a-69f7-48b3-b35b-1a49e5c1dabc/american_gods_season_3_episode_4_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1787e7a2-ccf4-49dc-ae4c-2711a819de5b/la_iliada_resumen_canto_17.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/68435661935.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/accounting_interview_questions_and_answers_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/jawinexalof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f868eabe-9627-4198-b25f-ef91ca8f9269/what_size_tires_are_on_a_2012_chevy_equinox.pdfIn PDF document text
    • http://gisatazab.rf.gd/neteg.pdfIn PDF document text
    • http://sejanaxopuvogiw.epizy.com/fazawafopebikifavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70dd69f2-ea4a-4343-bb38-9c791cbe1fe9/17075239313.pdfIn PDF document text
    • http://zorogeloma.epizy.com/49361037692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f103c0-4553-475e-a611-909baeb9719b/how_much_does_it_cost_to_replace_a_timing_chain_on_a_ford_explorer.pdfIn PDF document text
    • http://zoxuditavuvov.rf.gd/pobikad.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/camstudio_full_version_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/how_to_descale_keurig_duo_essentials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd0f81ac-8582-4117-ae6c-c137837e750d/kurederisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/551414a2-4336-4bc6-b32b-63462c72772e/best_way_to_learn_advanced_excel_reddit.pdfIn PDF document text
    • http://xuzinom.epizy.com/kafaxopuxaxedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd89f37f-e0d3-4524-8b18-b1e247d07121/the_three_billy_goats_gruff_golden_book.pdfIn PDF document text
    • http://semogifogu.epizy.com/89118044234.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 4972 bytes
SHA-256: aab987daad3ffc92a2fb6b24a933c682dfd2048fc8ccb2e1cd0c99f3253693e8
font_01_sfnt_off0001367b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 11552 bytes
SHA-256: 77d0eec6fd5249613475eac504c277876598483c22f0d420469af66a21d6528a
font_02_sfnt_off00015e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E01 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1
font_03_sfnt_off000172a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A5 9140 bytes
SHA-256: d4170115f3d017b002b135666790c1ec8fca12c0af5e11002f93f3ab9288380c