Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a352073f6c5f268…

MALICIOUS

PDF

66.3 KB Created: 2021-01-10 18:53:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7bb137f10179ba913d13f26f8ccfbc75 SHA-1: 925bdca7a8b0cc531f8be6a0518e45bd983f13a0 SHA-256: 3a352073f6c5f268cccda54277f9739a995bf3eebd0752f58467c2d76997cb26
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that redirect to external sites, including a known malicious redirector. The primary purpose appears to be directing users to potentially harmful content or phishing sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/wb?keyword=my%20airtel%20tv%20recharge In PDF document text
    • https://site-1172703.mozfiles.com/files/1172703/dig_this_81-_20_impossible.pdfIn PDF document text
    • https://jopulovi.weebly.com/uploads/1/3/4/2/134265775/ravuwuje.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/pjcdfjh/74229050461.pdfIn PDF document text
    • https://dosowaworizur.weebly.com/uploads/1/3/4/6/134688898/jipar-xomil-geluregeligeto.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/7192346.pdfIn PDF document text
    • https://bawenijujobafo.weebly.com/uploads/1/3/4/6/134670929/12449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_5fbf94814e1ec.pdfIn PDF document text
    • https://site-1198442.mozfiles.com/files/1198442/wings_n_things_pompano_beach_florida.pdfIn PDF document text
    • https://mijeridofuba.weebly.com/uploads/1/3/4/6/134677835/lifogowaxepunaw.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/c0b41416f75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000bbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB0 4624 bytes
SHA-256: f7e017f439b864aae34b88335a0ec056a4d9dfd46c4c5fe18aae53f50742054e
font_01_sfnt_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 10348 bytes
SHA-256: 36136aea97783f109fab0972def2e434d85ae064745c0ef2d2a04c49d65dddef
font_02_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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