Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9392735a6b0b04…

MALICIOUS

PDF

69.6 KB Created: 2020-12-31 02:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 401d187d9d2b4b5582fd656dacf219e3 SHA-1: 93cca6013951520c622e695ef1d7d96343383a93 SHA-256: 5c9392735a6b0b04a07f2499025e8d047ae46c20b6e64806df78331662231a1a
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics as malicious, including redirector links and a link farm, indicating a phishing or malware distribution attempt. The embedded links point to known malicious infrastructure and numerous other PDFs, suggesting a campaign to drive traffic to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=dark+legends+pack+price In PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/699d5bd341dca.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/gdL2OWD/30820471242.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/3086519.pdfIn PDF document text
    • https://dojenamolusojow.weebly.com/uploads/1/3/4/8/134868247/2914533.pdfIn PDF document text
    • https://ripulufixi.weebly.com/uploads/1/3/5/3/135388512/ralonibutifufor-domavelidakene.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/mYicvgf/36551265091.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/KWjbBA9/wubuvixodokogezivixit.pdfIn PDF document text
    • https://cdn.sqhk.co/jefokejab/gdiTshR/gixiwumajozuzapiwareti.pdfIn PDF document text
    • https://cdn.sqhk.co/kejalupegem/ighbjeh/zerofexavipurad.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/97654a1e-3ba3-49ec-bdaa-6bcf3e864abb/turevevepukudefagijanonof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99144e4a-9480-484b-94f1-89913bcccd39/93905709079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc462b50-26bd-422c-9de4-2af762617ec2/64082098997.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_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 5304 bytes
SHA-256: ee92d1fd43d42922b549543e8c80f5af90a2b5ff15359e57a57c03baf8ae51b5
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 11280 bytes
SHA-256: 6590f6b2c5534e484fc06a7819a18036cd1786bbea58f24265dc81db49830fca

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