Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc4050d32f45985…

MALICIOUS

PDF

71.5 KB Created: 2021-02-03 18:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2043fe2bf0833229968b7b7750929e71 SHA-1: 1e79962d4c9a68adf79fe11672bbb3459cdde085 SHA-256: adc4050d32f45985e3dc0cfa923245f594680e1286863f7d19a460d9639becdf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=turkey+gobble+ringtones+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405443/normal_60039dd0c4b4d.pdfIn PDF document text
    • https://vitozosusa.weebly.com/uploads/1/3/4/7/134727909/sawojubi_mebonisodima_xirak_benerozitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5fcc93bd3cead.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/rajatovenedagisimepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529095/normal_5fccff5f0848b.pdfIn PDF document text
    • http://bitipusefotas.66ghz.com/52188319260.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/panokojol/wumowirifenam.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/13507863339.pdfIn PDF document text
    • http://rimaxuj.rf.gd/caller_tune_song_wapking.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/free_printable_palm_leaf_template.pdfIn PDF document text
    • http://zifopodisinuri.rf.gd/hiatus_hernia_diet_sheet_nhs.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/46171625165.pdfIn PDF document text
    • http://tuxizowivu.rf.gd/flannel_split_king_sheets_for_adjustable_beds.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/gift_coupon_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/urinary_tract_infection_guidelines_2018_idsa.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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 4980 bytes
SHA-256: 7e2bb2850ee47e302016306d90f6372f26df2c2c65442d6c1a2860c1b470c3c0
font_01_sfnt_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 10868 bytes
SHA-256: 41970e24ab1357a0a40bc2a7a53087eaec9794cfcd6f44ae65002cbd8dc6e774

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