Malicious PDF — malware analysis report

Static analysis result for SHA-256 d461a2d7dfa507c4…

MALICIOUS

PDF

67.3 KB Created: 2020-12-10 11:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7e69535198bed7d1e6d92538cc1af48c SHA-1: ee1ba8f65837e662ff495c0b37cda2510b6d6aae SHA-256: d461a2d7dfa507c42a6c08eb66427f5e5926819055b474f11e86e6e3fc9ba41e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. The primary URL, 'https://traffine.ru/aws?utm_term=basic+college+algebra+worksheets', is flagged as malicious. The file's structure and the presence of a large number of external PDF links suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

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
  • 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.
  • 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://traffine.ru/aws?utm_term=basic+college+algebra+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5f988cb6cabdc.pdfIn PDF document text
    • https://zidabowejixu.weebly.com/uploads/1/3/1/1/131163559/e2470347764ae3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fd1b10ef072b.pdfIn PDF document text
    • https://mosawowogan.weebly.com/uploads/1/3/4/5/134511341/davosesevi.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/a6a9d1.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/dd69d725d98b71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5fc76f0fcbfc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_5fbc3c8c45457.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/tejuvonixag/41865431115.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/6085576830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a5cb8a-c97d-44e6-8071-42ac955e427f/21574997242.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/redhat_linux_lvm_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/pirate_proxy_list_june_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/mixed_fraction_addition_and_subtraction_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/oral_b_smart_guide_pairing.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_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 5408 bytes
SHA-256: 3215484c1bb703fdb2c03357db06e32d6b4b7bdb52953d938be018e503f93330
font_01_sfnt_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 10640 bytes
SHA-256: 43b923042852a384b43098de7f8a45ef84a660624d6b7ed6a97ee3ff7dda78e6

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