Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8238cf8343968a1…

MALICIOUS

PDF

107.6 KB Created: 2020-11-14 00:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b6602836b9564ec0afb2759cf2a85f0a SHA-1: e0812cedb31b1692a3c076318113098eca915c60 SHA-256: f8238cf8343968a132ad5a7e41c08fc837697a0ee5f31cf02d519ac5c853814b
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a primary redirector URL disguised as a search result for "amazing grace lyrics original pdf". Heuristics indicate this is part of an SEO link farm designed to phish users or distribute malware. ClamAV also detected the file as Pdf.Phishing.Trojan, further supporting a malicious classification.

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
  • 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://trafffe.ru/aws?utm_term=amazing+grace+lyrics+original+pdf PDF link annotation
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/kadivu_sumulej_pexixeladep_tifapetij.pdfIn PDF document text
    • https://wadazujirala.weebly.com/uploads/1/3/4/5/134596454/a071013f61.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/henghuili-files/27914346381.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/air_pollution_causes_effects_and_prevention.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/povonavojepelojovado.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/90405951262.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/college_algebra_practice_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/55958153620.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/adelaide_metro_train_timetable.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/nadia_from_american_pie_actress.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/lone_star_regional_volleyball_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/catia_composer_manual.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_off000168d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D4 5616 bytes
SHA-256: f5b7ef1498379a797b0a2b96f711d03b6d3098af7af8e0ecde4f1df7b3dd728d
font_01_sfnt_off00017bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF2 11292 bytes
SHA-256: 1b3084c9c4229c51c17b1206ca217cfd1116c8049ee5a629fdb0cd47021b8c36

Open this report in the interactive analyzer, or submit your own file for analysis.