Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b73f566dd19ed34…

MALICIOUS

PDF

80.9 KB Created: 2021-05-21 17:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a347f10c612f8c29303647cb759bb8d SHA-1: 27259e512ffb7f965b551ec34395d3d246b7543c SHA-256: 1b73f566dd19ed341365bbadb9a54a04d0e8a638319a9026903df0ed468fdd22
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous external links, indicative of a link farm or phishing attempt, with one primary URL identified as malicious. The heuristic 'SE_CALLBACK_LURE' suggests a callback phishing or tech-support scam pattern, further supported by the presence of a URL that impersonates a DVLA application form. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=dvla+d2+application+form+pdf
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/tatozilejaja_mubun_jonixakaj_xojaxumebake.pdf
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/2741969.pdf
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/6840483.pdf
    • https://bosesabefo.weebly.com/uploads/1/3/4/3/134362720/remazifamoxeja.pdf
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5ffc67a1a7af1.pdf
    • https://xuvetopugoseja.weebly.com/uploads/1/3/4/4/134484667/waxiwepexekizup.pdf
    • https://static.s123-cdn-static.com/uploads/4455659/normal_5ffa0dd63a41a.pdf
    • https://vilawamilufulob.weebly.com/uploads/1/3/6/0/136006615/zimevivowujojon.pdf
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/367fe731a10.pdf
    • https://vapasunodisina.weebly.com/uploads/1/3/0/8/130873802/bixojogipuza_pizezusokazi_nadesujuguremir_bitunir.pdf
    • https://static.s123-cdn-static.com/uploads/4490364/normal_5fce8702a1703.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woneketelak/xezeto.pdf
    • https://s3.amazonaws.com/paxunu/google_calendar_android_sync_problem.pdf
    • https://s3.amazonaws.com/tuxutedi/abtech_junction_box_datasheet.pdf
    • https://uploads.strikinglycdn.com/files/f8569364-3d06-4ecd-aa39-b7a0c2b39ed7/how_to_use_keyboard_on_rca_tablet.pdf
    • https://uploads.strikinglycdn.com/files/03ab6b4b-dbdc-446e-8754-19aeaad534f4/sikogawobozedukufodojim.pdf
    • https://uploads.strikinglycdn.com/files/15fcf5e1-17c2-4efe-9e6f-f89da69d62a9/duladajaxebavunizawiguze.pdf
    • https://s3.amazonaws.com/lezerawe/filmic_pro_apk_cracked_android.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/14222650409.pdf
    • https://s3.amazonaws.com/tutapaxi/jikokawuna.pdf
    • https://uploads.strikinglycdn.com/files/52826390-c072-4a96-9669-d29def6afa6a/629794310.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_off00010088.bin
c32ce4eaaf4e9c553a0c86f09a375a549aeb950a8a203b418aa42a12469b57ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 5316 bytes
font_01_sfnt_off00011299.bin
884a313bb1f356602b0b1f8084f1f638ca0761ecdb9509507639fd7e3d83d410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 10352 bytes

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