Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3bd4e5ef1f32f8…

MALICIOUS

PDF

89.8 KB Created: 2021-04-24 10:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 236c7ee3c975f811c590e7cfbd07bd1d SHA-1: 20778df04954d85cc5872526e17b7f5b7d7dbef4 SHA-256: af3bd4e5ef1f32f81d0a04e5654e9be17b512f41634683d484aa84b5b49076c2
146 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs, including one pointing to 'fokemale.ru', suggests a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic further supports a phishing pretext, likely disguised as assembly instructions to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://fokemale.ru/strik?utm_term=your+zone+metal+loft+bed+assembly+instructions PDF link annotation
    • http://toportt.online/john_deere_lawnmowerpreeq.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/synonyms_words_list_download.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/descargar_discografia_completa_de_los_tucanes_de_tijuana_1_link.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/doxatelobujanumeneragibub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443576/normal_5ffe567840ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fe83dac61bc5.pdfIn PDF document text
    • http://8gusevshop.website/arthrosis_deformans_kaakjous2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumurulepowele.myartsonline.com/biases_in_decision_making.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/89376989173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb9153d-1b62-4794-a979-1626333b1f91/japowalobipudiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3784556c-a24a-43f9-8254-3d6edba27960/sims_3_expansion_packs_worlds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b71692-61cc-4842-9276-74b257af71ff/what_is_wing_chun_kung_fu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a79e68-e5b3-47ff-a5f7-f99e8f4352f9/forofasezajoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d68d6e-c601-43c7-93f2-dd63d4b66f64/dungeons_and_dragons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7171e4-a877-48e0-95cf-5bd37a2c8267/what_is_the_structure_of_writing_a_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f2fcaa7-519f-4a65-aeb1-874ad7451a16/schwinn_230_recumbent_bike_assembly.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/principal_business_activity_code_florida.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 3776 bytes
SHA-256: 7577330055d53d308d5cd3dc6737cdd825b971aa80f7886e8090a7b6129f37fe
font_01_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 5420 bytes
SHA-256: 2be93e64747206cc5fec67b8476a8a649184a524ffccf4c9467fdc9bda44d5c4
font_02_sfnt_off00012f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6E 11904 bytes
SHA-256: dc443fdc4d02c7b7a010bda3c9eecc55c0f6c1980d89d7fc0c0e32abaf077733