Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10f38c2128a8d0c…

MALICIOUS

PDF

81.6 KB Created: 2021-01-14 06:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 31a17d506ee66e155bd7a8ec17095b41 SHA-1: d6cd9b3f7ec2b795badc3655a8ead1cb4d0d7f37 SHA-256: c10f38c2128a8d0c1064a4a2a95e649dc9fd0c1809e975a5a61b15e664581c46
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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a PDF redirector link to 'traffine.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links suggests an attempt to direct users to phishing or malware-hosting sites, likely disguised as legitimate documents.

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://traffine.ru/aws?utm_term=uranium+hexafluoride+safety+data+sheet In PDF document text
    • https://daxuvevirub.weebly.com/uploads/1/3/4/0/134013438/9720921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f86fe7aae283.pdfIn PDF document text
    • https://site-1182839.mozfiles.com/files/1182839/real_gangster_crime_2_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/eWDKihI/age_of_empire_2_cheats_unlimited_population.pdfIn PDF document text
    • https://cdn.sqhk.co/gifitebona/jggivib/xixos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5fd831dc8d9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f8ca52384cf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5fcf1bc061160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_5fb5ccab710dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_5fa537eeafc3a.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ii2Fji0/13301542153.pdfIn PDF document text
    • https://site-1168339.mozfiles.com/files/1168339/ahlat_agaci_watch.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/fogekukadumuxezatag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 5308 bytes
SHA-256: f313cda0b79d95a966b681f00d1c2baae20a76ebb86485936cbfc4989ddf13fc
font_01_sfnt_off00011394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 11152 bytes
SHA-256: 19079b01e544209f5cdce8890db28c6cdcc27ffae2a7f8c262175ef2a254c9d0

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