Malicious PDF — malware analysis report

Static analysis result for SHA-256 885a54f9fb1ec3a8…

MALICIOUS

PDF

73.9 KB Created: 2021-01-18 09:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4d0872ef9a18fea7c4805563cfdc1112 SHA-1: 75c8e82673369a368c1bd37a84fde8cc22e37f68 SHA-256: 885a54f9fb1ec3a86e07b67e155f7a0710495bd4449d9ac8a959961f98121d32
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites or initiate fraudulent phone calls.

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 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://traffnew.ru/123?utm_term=rtd+cu+boulder+to+dia PDF link annotation
    • https://cdn.sqhk.co/moviferu/0kFbgg0/blackmagic_micro_studio_camera_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/ehhrhg2/perevononudorasud.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/gfhfjjd/konamopeda.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/bezafibesuburogobematijum.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/gdjhNih/police_siren_sound_effect_app.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/347gehd/90_s_pop_album_songs.pdfIn PDF document text
    • https://site-1176547.mozfiles.com/files/1176547/29315844969.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/ggrKijm/teen_chat_for_teenager_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/hegjc6X/95971664096.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/njdrdif/spooky_sounds_app.pdfIn PDF document text
    • https://site-1178004.mozfiles.com/files/1178004/58784550762.pdfIn PDF document text
    • https://site-1178961.mozfiles.com/files/1178961/16792436473.pdfIn PDF document text
    • https://cdn.sqhk.co/liwewajawab/heVmjgw/25128638162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/31620502783.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/judas_contract_terra_death.pdfIn PDF document text
    • http://pidezesu.rf.gd/74849164895.pdfIn PDF document text
    • http://wekidezeze.epizy.com/50907634650.pdfIn PDF document text
    • http://dogamesesokuj.rf.gd/36535630812.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/27860676039.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_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 4904 bytes
SHA-256: 2a1eaabe79210d4fbedc3c716bc2e9ec3dc078ff766213cd17e7d14e60f10e27
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 11520 bytes
SHA-256: 118d666da36fd4fdfdad18541659791a2e2ff8861390bc5c8f393f4f55cba7a6

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