Malicious PDF — malware analysis report

Static analysis result for SHA-256 9072c5f10ba6c1b0…

MALICIOUS

PDF

77.7 KB Created: 2021-04-05 17:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e3ff098a7f09e48708f706414f0d29b SHA-1: 80f988468e9bb0b4770f2a14cfcb9574f7e0e04e SHA-256: 9072c5f10ba6c1b040f1ce297e1ac3212ede203288f0a44fe844013d99e80c30
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/wix?keyword=genetics+basics+worksheet+answer+key PDF link annotation
    • http://vuvuga.xyz/1693844144rn51i.pdfIn PDF document text
    • http://dragonflysagewellness.com/714478147296o3he.pdfIn PDF document text
    • http://canonsburglake.org/jodepasojuragabi92yd1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_7e46c52286c54faa9b18a86b8a006a78.pdf?index=trueIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_89412c39fad5497288058ebcc5321888.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_6c350f7791d64e6c9292aa2a191a8f27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/omegle_tv_mod_apk.pdfIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_460e11fb2c394e7d830a10a56dc61305.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/masevewi/cpa_financial_reporting_notes_2019.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_b7256b45b73541c99ea90bed4b185ad1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/how_many_awards_has_gary_paulsen_won.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_41d9b7239d94425d9f12d993c354451a.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_c1caeac7bb7a456fb3ecd6ad098fa774.pdf?index=trueIn PDF document text
    • https://109d6476-c6f4-4eee-b84c-907698fb4207.filesusr.com/ugd/0d7ebf_b26a00199d9e4f98955fb3eb4cf0ad94.pdf?index=trueIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_d0c07da475ff48b697c2474c30bf7049.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_90a4e492a35340779d19e34830cef88f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vazisi/real_magic_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/novubomudonexubezojur.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_e95e845b02d44a42888f0824fa9ed7d6.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_0e4626c7da7f4ff18fcb4f631271fa42.pdf?index=trueIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_5d3bc3b5098f4c8f9d9b96de66f62548.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_6819ce586e644e4cbf4ada9e8c03461e.pdf?index=trueIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_2a4a528c0a274e88b78b23a2c847f134.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_e17fafb6c9d64612b04a85ce93a67b3f.pdf?index=trueIn 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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 5284 bytes
SHA-256: 39565f314dfa08a165f88a5e14cbdb26a267f1780a7eb16ccee18810e73b0b1d
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 10620 bytes
SHA-256: cb96b5c044ce02c82f6eab1ab9394571f629d46d33d37a72167c71662026cedf