Malicious PDF — malware analysis report

Static analysis result for SHA-256 214b6ac5de6d54a9…

MALICIOUS

PDF

82.4 KB Created: 2021-01-01 08:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 634fe0ffd771787d55049b479f93db26 SHA-1: 54a719cf60ab4f083ed7ec9c32c0af0d6afa5ee1 SHA-256: 214b6ac5de6d54a930859d18daca1f8d6c599de8147164ceaf842cae1831e3c6
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links to external PDFs hosted on disposable domains, forming a link farm. One critical heuristic indicates a direct link to known malicious redirector infrastructure, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the extensive link farm points towards a phishing or malware distribution 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=pac+man+ghost+pumpkin In PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/5152477.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/gZUghib/56464507452.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/fibotegasevefa.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/9243522.pdfIn PDF document text
    • https://maxolesaso.weebly.com/uploads/1/3/0/7/130776327/sebitanag-dugepaxanoxupum-vemijuxutumok-vivikuletu.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/jdjjhjX/charcoal_barbecue_grills_at_lowes.pdfIn PDF document text
    • https://movojedafep.weebly.com/uploads/1/3/0/8/130814843/wisileromokowu-botipojuso.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/hghhDhg/21473423364.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/313378c9-ea96-48a0-83fc-ba08e945612c/delumokegikobumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c5398f-ce0a-49f9-abd1-2cac80878a22/kukurededomifederababe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44afdc7f-dc77-4562-bd33-00a8bf26e45b/gukegofor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d13992e-7536-4aff-b001-9e4120ed5de2/1301881704.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/12515842347.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 3688 bytes
SHA-256: cc79405a10d65e215ecb5c57821f31642531f1731d116e58b2e5c96b6586431e
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 5284 bytes
SHA-256: 84bbcc928cc899194b6e3cebe343cd3400f438ac80fac643b01f752cc671f47f
font_02_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 10636 bytes
SHA-256: 4ef5d1313c65cc8a949dd0d5017b040fd378abca95ca79262168581dc7daddf8

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