Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8034008496ce7a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-23 15:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 489f5310ee004f5c4223fcb5966093c0 SHA-1: 39fd1551a37e1d8ffb3cc3c4a7ad300e9b391e7b SHA-256: ce8034008496ce7a0ebbdd2637f17a1729f903c5e98c010d254f16873b702a66
254 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to redirectors and SEO-optimized PDF hosting sites, indicating a link farm or phishing campaign. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of URLs like 'https://yafferge.ru/123?utm_term=do+spells+crit+5e' strongly suggest a malicious intent to redirect users to harmful content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://yafferge.ru/123?utm_term=do+spells+crit+5e In PDF document text
    • https://cdn.sqhk.co/jivomawufem/ck3gjgh/free_throws_or_pink_bows_backdrop.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/gdLDba8/kirby_vacuum_and_carpet_cleaner_combo.pdfIn PDF document text
    • https://vukuwapebu.weebly.com/uploads/1/3/5/3/135310377/zeraw.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/gg0jkPT/commander_in_chief_us_pacific_fleet.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/vzliajj/mefenamemasagu.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/biieLIt/64333752693.pdfIn PDF document text
    • http://autoupgrade.website/vefaxomu40ulc.pdfIn PDF document text
    • http://apelsins.space/fubegevujwuct.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/jehiIDi/pexixedimurumeravoni.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/cIgfHic/piano_notes_labeled_on_keys.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/ihcibeh/29546553678.pdfIn PDF document text
    • http://interbank.link/scaled_boundary_finite_element_methodjme25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 4520 bytes
SHA-256: f9568e537e77da0465cfcfba04af1a210cb2107575b7bfca5abb4ba894c57f54
font_01_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 10148 bytes
SHA-256: 7f6cac8a2b5046c592f512513ece9462298d8d94a377bcd3b05b634e997255c5
font_02_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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