Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6c1d90b10a2878…

MALICIOUS

PDF

72.0 KB Created: 2021-04-25 12:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e939658cb12630f925035ab8729c0fe1 SHA-1: 53ddaadc2f90bd14970ce20bda0fdb2af1007505 SHA-256: 8e6c1d90b10a28785fd8886e9db29a14d1c308cf4485dbd2a45e047462cf1e68
176 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a callback-phone (TOAD) lure. 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 0.9996

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.
  • 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://jacksth.ru/strik?utm_term=how+to+check+the+status+of+my+usps+application PDF link annotation
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/8417947.pdfIn PDF document text
    • https://lavidibiw.weebly.com/uploads/1/3/4/5/134582964/463418.pdfIn PDF document text
    • https://sinemitivivofa.weebly.com/uploads/1/3/0/7/130740142/zenutexafir.pdfIn PDF document text
    • http://mivolamuzimapu.22web.org/is_the_2015_honda_cr_v_reliable.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/memunem_pufimozive_pujijopu_bituzulakutet.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/783f633b-4508-4083-b916-438734cc3dad/the_expanse_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/76802487170.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_7d0e222ce5754dc69d59f219c6bd9cdc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/nexurapoxuzexaxemum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9252d744-43e7-408d-ac14-1e66457c4e6a/tikefararugenib.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/advanced_technical_analysis_books.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/tetiziz.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_7cc5eab297ac4b44af90dfdf67ced23e.pdf?index=trueIn PDF document text
    • https://20e8ec16-a7ca-487e-906f-4b2d5c2744e2.filesusr.com/ugd/ab81b8_c3ae5ee1ac1c4e549143163cf73c8f14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gifiz/child_travel_consent_letter_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/vorova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/061583fe-bb55-4380-bff0-08537861dcd9/57720355180.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/boeing_737-_800_cockpit_layout.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/24379476139.pdfIn PDF document text
    • http://fixokofo.rf.gd/journal_el_khabar_algerie.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_faf40d7db404453c82f122b6c95214b8.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 5376 bytes
SHA-256: 6c42c3479693b8446265667c39f170da2d5a668ef3c49ed0e81be191ec07af49
font_01_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 10620 bytes
SHA-256: 6d977a0825ba4f64b7560c6c46a0a49734784b4027f79cc2dfcf571f5535b611

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