Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb681ad44dfc0a39…

MALICIOUS

PDF

74.4 KB Created: 2021-01-10 04:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dca81c3777850cf447188fba8e889066 SHA-1: 443b8d8c3595776f315a1a00f15f729a8d6c2084 SHA-256: eb681ad44dfc0a399bd5ae88290d65395bbd7dd4d0dd9ee149f82c58abdb9f12
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to be a lure related to purchasing materials, which is a common tactic for phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://trafftec.ru/aws?utm_term=where+can+you+buy+corrugated+plastic+sheets PDF link annotation
    • https://dixugoruvaweg.weebly.com/uploads/1/3/4/6/134616472/0f8c4d05f4.pdfIn PDF document text
    • https://bekawoxe.weebly.com/uploads/1/3/4/5/134529307/kiriz-rubukaruka-xewizebe.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/jiqJYic/voice_changer_sound_effects_app_download.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/8211781.pdfIn PDF document text
    • https://nokurujifeseg.weebly.com/uploads/1/3/4/3/134355409/visejiviwonim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5ff17904a1b6e.pdfIn PDF document text
    • https://suvuleje.weebly.com/uploads/1/3/4/8/134871599/8237355.pdfIn PDF document text
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/sogewu_fakavaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/ZIgduBi/51562711501.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/8681823.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/gujutavevive/starry_night_peggy_gou.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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 5588 bytes
SHA-256: 4f69efbc27aad751347fb84d6831fa9c84e794e5237e1528ae57392b44249a65
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 10220 bytes
SHA-256: 64996c5a7ff8dacd1b856ab4192578c4382202e0c3782df8145899e233c6af9a

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