Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b401fe87128e638…

MALICIOUS

PDF

70.6 KB Created: 2020-12-28 17:37:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a83af6750509325f154df9b062329fe2 SHA-1: 7000a66194dcff7bf38f6a9011197d133c2c701a SHA-256: 4b401fe87128e6382f3cd5d3cb1064d950e273a93927665d895551b820a14cc8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The primary URL observed is 'https://trafffi.ru/aws?utm_term=adverb+clause+of+manner+exercises+with+answers', which is likely part of a SEO manipulation or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://trafffi.ru/aws?utm_term=adverb+clause+of+manner+exercises+with+answers PDF link annotation
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/buwafemojuzota.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/7488182.pdfIn PDF document text
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/5101613.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/kifuxunokifa_muwexonesa.pdfIn PDF document text
    • https://mitezexevas.weebly.com/uploads/1/3/4/5/134525922/numapopegan.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/949369.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/fjhRCji/nursery_rhymes_for_babies_video_download.pdfIn PDF document text
    • https://kapaboni.weebly.com/uploads/1/3/4/5/134597735/gaputilu-galokuwifosapi-dunutikitufi.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/iifigCc/lifeafter_game_profession_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/xrhhgii/roll_up_ice_cream_stadium_drive_kalamazoo.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/f47842c5-80cc-4795-87d8-6f0b750ad7dc/41975690379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d406e6f-55be-4504-8411-fa4310ca6627/sanatol.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/kitevoniba.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_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 5608 bytes
SHA-256: cfc70791a54c8528d8fbb81d643bea8c4310899540cb5ca378cd09e10dc6d2ec
font_01_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 10560 bytes
SHA-256: 75e94b40a873f0a1512cafb053b51ddcaa76706e91749482e2dbc12be5f195a5

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