Malicious PDF — malware analysis report

Static analysis result for SHA-256 6706f31a686ee226…

MALICIOUS

PDF

74.2 KB Created: 2021-01-10 18:09:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 99cdc39e4250fff435206a0ccd0a41af SHA-1: ea93f5787fb8b7d4e12cea5ceb5709177909e988 SHA-256: 6706f31a686ee226351afa34c24d2dcec6e13351116885dbf76f31b511d64ecf
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. It functions as a link farm, containing numerous embedded URLs that direct users to external sites, some of which are hosted on disposable domains. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

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.
  • 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://ggtraff.ru/aws?utm_term=android+sdk+api+versions In PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/7326fdda0f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5fc21ace88920.pdfIn PDF document text
    • https://site-1177296.mozfiles.com/files/1177296/dialer_codes_for_lg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_5fc14c54803c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424953/normal_5ff49d7613001.pdfIn PDF document text
    • https://site-1171584.mozfiles.com/files/1171584/vomoxojalevumapisutemud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f97b6da0f1e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fdc6eb753250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_5fa9c97a4ceae.pdfIn PDF document text
    • https://tikoresi.weebly.com/uploads/1/3/0/7/130775690/7285741.pdfIn PDF document text
    • https://site-1175508.mozfiles.com/files/1175508/hitmonchan_build_sword_and_shield.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/vedexajawo/18666347610.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/west_bengal_road_tax_receipt.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/bricks_beads_and_bones.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_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 5032 bytes
SHA-256: 755bac8b85baed8a22ad14beb7494d2d2bcc89ed2a1ff600e4ae92d0a507fee9
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 10400 bytes
SHA-256: a3c0286c0e35763cd8db2b1aa50438678cddd41d16afe444a78c4a94a8b0b5d2

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