Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce9757168d30e26…

MALICIOUS

PDF

66.8 KB Created: 2020-12-15 11:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1c85a7210ef58dd34e10464847250144 SHA-1: bb0ee2993f19c2a6a8776ca61f159890c95fc02f SHA-256: dce9757168d30e26d737cb9f9b7da6720585a8b3fdbf8a70f545ba6a94f02b2e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a "PDF link farm" pointing to 26 external PDFs. The primary external URL observed is 'https://trafffe.ru/123?utm_term=cry+baby+gifts', suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=cry+baby+gifts PDF link annotation
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/8b752a6ab4c.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/difidupexajifim_pivotenafiw.pdfIn PDF document text
    • https://sewokowoxukipa.weebly.com/uploads/1/3/4/8/134846336/2725562.pdfIn PDF document text
    • https://vufizirisabewi.weebly.com/uploads/1/3/4/4/134443644/3a6318b5.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/pozokimepe/politically_incorrect_guide_to_the_british_empire.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77a6fc39fde0238aa1b24/t/5fcb51cf11c29807e6d73dcb/1607160271412/hocus_pocus_3d_mug.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc002e7e5c7695ca996b6a8/t/5fc307a23c6ccf69f3c290fa/1606616995023/stick_war_2_order_empire_unblocked.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a7ede9fc3622d52d662b/t/5fcfdcd24c0c42365b527c6e/1607458003049/rosiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/vuvexovosawemijen.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/tefazitesuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/cse_8b_ucsd_soosai.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/revenants_osrs_slayer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/64530547111.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_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 5052 bytes
SHA-256: 3b43cfe55f9ad813bd401bb55f454b512cfc5b37c443219aabe66684af109088
font_01_sfnt_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 9992 bytes
SHA-256: 4cafd93bcd976fefa60a1ae0911c49b41c1f5bfb2a831e663db75e2e6495838c

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