Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2c8eb0402d9d0b…

MALICIOUS

PDF

75.9 KB Created: 2021-04-17 08:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 51c4cfcf6ddcbfc172dda00cc5c72018 SHA-1: 1569183659658221e4a395911dd97ae697aea3c5 SHA-256: ec2c8eb0402d9d0b2913f82ac4358cf5c74e62db502e31b29c76e2e74e880b02
146 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext, although the document body itself is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) 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://dugedepap.ru/strik?utm_term=accuair+elevel+sensor+install PDF link annotation
    • http://realwockyc.info/vino_el_amor_capitulo_71oxye2.pdfIn PDF document text
    • http://electorat.org/49551503020s87dn.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/ibgej4I/71452606894.pdfIn PDF document text
    • http://btsworld.org/toeic_reading_part_6tfw3y.pdfIn PDF document text
    • http://thechambre.xyz/healthy_coffee_drinks_at_dunkin_donuts5sjs6.pdfIn PDF document text
    • http://meetsol.xyz/77965109366giozq.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/pifelog.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/07nki45/23231286984.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/68944672334.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/jhigjh0/98373446803.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/how_to_add_formula_in_openoffice_writer.pdfIn PDF document text
    • http://wide-do.top/dijifepadavobepi3hg0h.pdfIn PDF document text
    • http://vclean-sale.shop/wegonosadisankuh0m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_b03194f6e99f4db196effd28df769a12.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_6ecb7e3527cb446f88bd6c9529e0a00a.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_8c98b5534d874516b40aa6840233a9e7.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_7623a0c0fc084d2c93e923aa717346ed.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_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 4844 bytes
SHA-256: da28705b08ac758bff3ce962c161f862b7fc078f2b0d845e18a6a54d889e67fb
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 11336 bytes
SHA-256: bca76047b30dc4ac8b4847ecf9c29768d8450c0eeae5246ffefb657e8a1b7bc2

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