Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8814aa7efcfc06…

MALICIOUS

PDF

99.5 KB Created: 2021-03-25 21:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c33601fb10b0ccbf4f270d723f6af71f SHA-1: 513f50276d970c150bc93a3bdc9d00e9a650ae4c SHA-256: fd8814aa7efcfc06bff6d2ff52dce8e0000e1dee4cf8c994f09c948dbb92ad06
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary malicious URL. The presence of a callback lure heuristic suggests a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/wix?keyword=sony+str+dn1040
    • http://vovpomnim.ru/66748383638k76xw.pdf
    • http://rusakova.space/les_sims_freeplay_mod_apk_iosm919b.pdf
    • http://trikotoria.ru/23937664280foejy.pdf
    • http://fc-aromat.ru/who_started_guerrilla_warfare_in_the_deccan_against_aurangzebknb5u.pdf
    • http://helen-art.ru/parasovozibuduviripuwifa3vy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f6c46446-8648-44ed-be12-bb7ea5e8bdfb/jemuf.pdf
    • https://s3.amazonaws.com/dotivaf/dujuxewojelenowax.pdf
    • https://uploads.strikinglycdn.com/files/ff819fcd-ed4f-4b94-a46e-e2d7e272da81/what_is_the_xia_dynasty_best_known_for.pdf
    • https://uploads.strikinglycdn.com/files/29a66ebd-d146-4ea1-a0c2-a2f91cafa3cd/jilimosisosobu.pdf
    • https://uploads.strikinglycdn.com/files/de537fb1-f553-483c-8cea-e9397e331ac2/tosule.pdf
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_a8625247033642068cfefc97fcc13530.pdf?index=true
    • https://s3.amazonaws.com/sonutopexaramuf/4152131021.pdf
    • https://a86b13d2-a9ad-4039-ad74-10d2f7332aba.filesusr.com/ugd/6e2451_2dec8a599634493cad70b1aedd6c6301.pdf?index=true
    • https://s3.amazonaws.com/zagapaxa/state_the_5_principles_of_natural_selection.pdf
    • https://uploads.strikinglycdn.com/files/6f00a4f7-425f-4b72-a5f1-642072d6fc8c/sowiduba.pdf
    • https://uploads.strikinglycdn.com/files/7f20af61-d527-4481-8930-7dddaeceabb1/8316289842.pdf
    • https://s3.amazonaws.com/tazopaju/43129079857.pdf
    • https://uploads.strikinglycdn.com/files/e88b8a94-73ad-42a1-b378-a5d91a083d2d/64360791062.pdf
    • https://uploads.strikinglycdn.com/files/877ba8fd-dc03-452d-bed6-613a8559dbbb/what_is_quantum_jump.pdf
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_a37228abede7486ab7cd789f13e2fb72.pdf?index=true
    • https://s3.amazonaws.com/wiwuxot/chamberlain_940ev_evc_compatibility.pdf
    • https://uploads.strikinglycdn.com/files/264663a7-5ec7-4712-83c6-00a1482ddcbb/27179722528.pdf
    • https://26aaa629-0581-4e25-ae32-a194504e59ab.filesusr.com/ugd/2d4e87_f8b474b063c8449cbd59da7be5bd55fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7339d2d1-b07d-400b-ab7b-06250e17a830/laxozojawuzupuzul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014691.bin
619c1fce7adaefe6ce88805c692a7d967a457c69775ac0094668d85db6d44e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14691 5064 bytes
font_01_sfnt_off000157eb.bin
179a9905eff47202c462d63bf8d325d8f9af1e8cc09529b13780c1782e907ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157EB 11600 bytes

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