Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f19534782b9e295…

MALICIOUS

PDF

72.3 KB Created: 2020-12-22 21:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6c4e3b269d6f5a0803964241ebbc1c0e SHA-1: 95bba864dc72167417af053d94c59c679cb5e106 SHA-256: 3f19534782b9e29586b396a469272e27b97023afd35a74088db38f3261c7a4b4
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors and potentially malicious domains. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to create a link farm for SEO manipulation or to distribute malware. The presence of a ClamAV detection and ML classification further supports its malicious nature. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffset.ru/aws?utm_term=esmo+guidelines+head+and+neck+cancer PDF link annotation
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/0ac65f19349dc76.pdfIn PDF document text
    • https://nixovutak.weebly.com/uploads/1/3/1/4/131406963/0dff54637a6f.pdfIn PDF document text
    • https://sazunanul.weebly.com/uploads/1/3/4/4/134488017/rofomiwupifav-zubud.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/lemefofutomapox/boss_movie_video_song_in_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf029652-54f4-4ec7-a7ca-928e879a8fc6/caps_lock_minimizes_overwatch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248f182c-2bac-4b77-9b50-518629c384dc/prop_examen_college_kahuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e210dd05-2da1-4ef4-b0da-c09093198e83/pulafatizesuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06212f2f-e6c3-45c4-adab-fe685526e566/graphing_practice_honors_biology_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfabbcab-3714-4316-83d4-7c3bf7ad2da7/90520886080.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/benenden_health_cash_plan_claim_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2bc703-cb87-495b-a054-18e796aebe31/nordic_lodge_rhode_island_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96513782-9b64-4809-a2c3-4c2a1144a2ff/cer_verbs_french.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 5376 bytes
SHA-256: 1fd3b31e98c8e120b8d5f72aaa98da33081bb7098a9a13f116736d5efc3b2e72
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 10976 bytes
SHA-256: 7f6e5e249be0c05091728fc55763a8d15b1f4b2141d721f88e5e9e198499ae5e

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