Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53c019ad30c693c…

MALICIOUS

PDF

67.3 KB Created: 2020-12-17 18:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e0b92412791839a072e9e52cd7d76c42 SHA-1: e9f9b17366c145ac20f547743a9267a034b8b0ca SHA-256: f53c019ad30c693c1bda6ac7b00972baa2944928a676086f2a185c50d9b1076b
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, specifically pointing to 'traffine.ru' which is flagged as malicious. The ML classifier and ClamAV also strongly indicate a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=making+friends+brownie+badge In PDF document text
    • https://febafowizozijuz.weebly.com/uploads/1/3/4/8/134860945/6669149.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/e1c343062.pdfIn PDF document text
    • https://liguroxuf.weebly.com/uploads/1/3/4/4/134443360/negojilaje.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/wupuf_zifeme.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/8520540.pdfIn PDF document text
    • https://nitisalapoje.weebly.com/uploads/1/3/4/6/134684797/5781638.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5fce09472b223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f9d99c2e4ae0.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/50ff6d51-172d-4b1e-8f28-9369cd2ec450/rufuf.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/free_invoice_html_template_bootstrap.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/ethical_dilemmas_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/latex_beamer_insert_page.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/fiction_reading_comprehension_worksheets_8th_grade.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29d8327a199023ac0643f/t/5fcf02ea7379aa35976e5de8/1607402230000/silotudanuzezodusazuxelur.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/abridged_novels_free_download.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_off0000c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 5344 bytes
SHA-256: 55824109e16fa8bb5577d8f829b58e6ebb1e0434d45a2f52b9ea86aec9c1e224
font_01_sfnt_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 10820 bytes
SHA-256: b7e9a12e6a3ec1a67b8c2dd545cd25a6a9041cc0a7136282a121a25ced290ded

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