Malicious PDF — malware analysis report

Static analysis result for SHA-256 51abfede505b14fb…

MALICIOUS

PDF

70.7 KB Created: 2021-03-01 09:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 7458053c9ef3862f1a7391804a399cc2 SHA-1: 43ba7fc79e65e98c923c030e1fa8cf06d27e3b85 SHA-256: 51abfede505b14fbe3de6bd010cbf55e413abe015825b7889c1a73a6be1760cb
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to redirectors and potentially malicious PDF files, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The embedded URLs and the PDF structure strongly suggest an attempt to trick users into visiting these external resources.

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://druttle.ru/award?keyword=how+to+use+summation+on+ti+89+titanium PDF link annotation
    • https://cdn.sqhk.co/vopunokapire/B9Mhaid/rubuvunakolifej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410985/normal_6002dffed5764.pdfIn PDF document text
    • https://nomikevokatipo.weebly.com/uploads/1/3/1/8/131859895/gixatuxoxup.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/aie7gfD/callaway_gardens_christmas_lights_groupon.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/mejeru.pdfIn PDF document text
    • https://vetitigozep.weebly.com/uploads/1/3/1/4/131437709/pigizasokologab.pdfIn PDF document text
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/16729279a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_5fd88bc31b017.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/3aba98.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/oXNejgL/zujiwagomebitetuv.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/rawitewozuz.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/gasodamuza/t_shirt_order_form_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/raxiguputizonos.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/77919083420.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/6658856599.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 5108 bytes
SHA-256: c6c8acfd17ff1c48ff1c578a2738d888643dfde9b50f849b4698f5d15e3e62f1
font_01_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 10196 bytes
SHA-256: faf45dbd09b455358ddbd1250134df07264474f9b12d58d88bddfb596d2f0e28

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