Malicious PDF — malware analysis report

Static analysis result for SHA-256 a511fdc002c8f964…

MALICIOUS

PDF

112.0 KB Created: 2020-12-18 07:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c8bdc835306988f1703399007fa5b8f5 SHA-1: 679bf13642aedd19a5ebd12ee127cbe01e19ae03 SHA-256: a511fdc002c8f964f226a44396d4dc3c9354ca63fbb9268e88582bccbc0c1162
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL 'https://traffnew.ru/strik?utm_term=virgil+aeneid+pdf' is likely the primary destination for the attack, aiming to exploit the user's trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=virgil+aeneid+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f978bdb0a3c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f9414e79a8ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451363/normal_5faa30f33a645.pdfIn PDF document text
    • https://femimujuzo.weebly.com/uploads/1/3/4/6/134640298/bajisiduv_janimugusesive_dizijoxur_daretajupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fd3492907025.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/6922377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5fa9dc6123ddd.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/4111619.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/goneduzum/fireeye_hx_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/ascaris_lumbricoides_sintomas.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/degezij.pdfIn PDF document text
    • https://s3.amazonaws.com/rutojo/argus_enterprise_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/margaritaville_bali_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/725-223-1629-1127_is_true.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/act_73e_answers_english.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/tafitebafeganipomidijut.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E7C 4996 bytes
SHA-256: 3ac8ec07a7ddd7f941b3a14eb31b122fe0bb07bf737a8873b571704f15941df4
font_01_sfnt_off00017f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F8E 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00018af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF1 12124 bytes
SHA-256: dbad07273de815033fca9589bfd1bf5f0c576b3b0bf812e83790f0d7aaf73158

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