Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b278732690fa8d…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 03:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 20fd852edfd746476caedb31f4bc977e SHA-1: dfff7d73b8fbf2489a4710345f9fe056754774e7 SHA-256: 62b278732690fa8d46cd733977fd91541860817c2c067dfe075f1d3ad3e992e4
186 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. It contains a large number of external links, many of which point to disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://gimoguvi.ru/wix?keyword=skyrim+random+alternate+start+not+working', is directly associated with the file's content, implying a lure to a potentially malicious site. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/wix?keyword=skyrim+random+alternate+start+not+working PDF link annotation
    • http://italysummer.fun/how_to_hack_with_nmap_and_metasploitg8d5g.pdfIn PDF document text
    • http://claire-irk.ru/what_are_social_influences_in_marketing0mpj6.pdfIn PDF document text
    • http://probmake12.xyz/signals_systems_and_transforms_5th_e6tr0u.pdfIn PDF document text
    • http://zarabatyivat.ru/ravebibepqcenq.pdfIn PDF document text
    • http://hopecommunitynaz.com/application_format_in_english_for_bonafide_certificatejv1lp.pdfIn PDF document text
    • http://begdas.space/batman_joker_songs_free9jlby.pdfIn PDF document text
    • http://onlinetyz.xyz/what_is_the_order_of_the_fantastic_beasts_booksewofh.pdfIn PDF document text
    • http://zeropium.com/ganoxupafeafho0.pdfIn PDF document text
    • http://devicesprotectionforusers.site/46898920138wwlgc.pdfIn PDF document text
    • http://mxbur.fun/ms_excel_advanced_test_questions_and_answersx6hdp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffeb9247-b703-43a3-9462-d9c20ee7ee3e/lisajomabewozol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f169163-a19d-4ab1-af40-e286e8aa124c/uk_driving_theory_test_practice_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c911271-b06a-4ec8-bf68-66c8f8e9dae2/codigo_ascii_para_cerrar_signo_de_interrogacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e3d6bd-4739-458d-9e4e-aeaa3c95450f/autocad_3d_drawing_into_2d.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_c97f0f017dd34de7bc697f2677e14940.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b16e05a-851f-43dd-b4a7-d805ed3265be/41744679604.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_ee69b777878940358d9a8ca492156ad5.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_a8fd7293749147c296fb7295f9730aa5.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_0a0df17b33864739b696d239c0ffcca4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f000e7-76bd-4653-a202-2d4b7e0587c7/keto_dessert_recipe_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 5508 bytes
SHA-256: eb1cd52aabe5aef09498fe80b4e5828a3b1d116544cfea7a8f5757513bb97a02
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 10748 bytes
SHA-256: 04cb5e12e337bee1d18b782c0c4cf69f15c3f6d8796fbdb1ef6df75ad0c17f6b