Malicious PDF — malware analysis report

Static analysis result for SHA-256 621c59048459501e…

MALICIOUS

PDF

69.7 KB Created: 2020-12-25 19:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fcac972cccb464c76dcf7a36dea39495 SHA-1: 2da1220c7b82f4f7c11101bff72f7a040dd1f4b9 SHA-256: 621c59048459501ee68f3b6c74706c810e0bcf267b844c31ab10c3314b333eba
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The presence of numerous external links, including one to an SEO redirector, suggests an attempt to drive traffic to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/aws?utm_term=immersive+railroading+guide PDF link annotation
    • https://cdn.sqhk.co/fewisezux/2jgwhjj/racers_vs_cops_multiplayer.pdfIn PDF document text
    • https://cdn.sqhk.co/gatutojuse/iicjgfo/nissan_cube_dashboard_symbols.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/a9e7f.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/eaheuOJ/domino_s_pizza_hawaii_coupons.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fab9dc5ac859.pdfIn PDF document text
    • https://fegedagupadid.weebly.com/uploads/1/3/1/8/131856554/0a941ce4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/99cb7cfa-14d2-4c8d-beff-77ba5ed60dfe/jineruturigebuxuxak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc38523-7923-4b88-aba6-5213f918722c/difibuzexolukaditutejolur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc19ed77-f0e6-4af6-864a-72e3834dc842/pokemon_glazed_cheats_infinite_exp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b98792e-b03e-4eaf-b1cb-550611caec04/desujodiramupom.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 5

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_off0000d4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 5144 bytes
SHA-256: 665fb68c0818de296239592039e735147b85aacdc6f42e32c3e1d5a1efcfdc91
font_01_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 10488 bytes
SHA-256: 7955b91f8aaa1ef0be6871c6007f90be3ca94109e463f8527fcd6b801d5181b6

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