Malicious PDF — malware analysis report

Static analysis result for SHA-256 a368df55ff81a985…

MALICIOUS

PDF

84.3 KB Created: 2021-03-09 20:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 524bc9d0ee9f2862fe54c477a1933d34 SHA-1: 232de1445b3cd032107d84169f9900f8974f9c70 SHA-256: a368df55ff81a985b03ea3dee7a41760478fa39c016ffa14115c54787cc0a6a8
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO abuse for malicious purposes. The ML classifier and ClamAV detections strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://kuzutuzo.ru/wix?keyword=holt+spanish+2+vocabulario+1+capitulo+7+answers PDF link annotation
    • https://gumewixolasadaz.weebly.com/uploads/1/3/4/6/134659592/jabasasulez-fubowofowas.pdfIn PDF document text
    • http://obzorov.site/monopoly_rules_doublesx5h14.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/Tiegcgg/rebuild_synonym_and_antonyms.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/1afd62.pdfIn PDF document text
    • http://copyrightsupport-ig.com/lubagemaxatizolizanejuficlttd.pdfIn PDF document text
    • https://dexigator.weebly.com/uploads/1/3/6/0/136049715/vuxiwixakoke_dusamisaki_tepuw_fumejiden.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/Clhhicl/eartha_kitt_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/kisudosus/iigfyF1/porulomufatalujamutoj.pdfIn PDF document text
    • https://tutamakut.weebly.com/uploads/1/3/0/7/130776204/romexesapamixad.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/vihMqib/69345089114.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemixizafij.rf.gd/60688246433.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/berinagedixujojegagijer.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/best_druid_circle_of_the_moon_build.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/jovusexovopidopiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/iba_arbitration_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/24165981313.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/pegeforutenegonukilaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/rrb_je_old_question_papers.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_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 5536 bytes
SHA-256: 2dcf71842cd40087c724f55f201392a47bb0dd0ef14e4d431533e26a72b4eb61
font_01_sfnt_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 10732 bytes
SHA-256: 6f56e4ab9d3b91a843db13c7393fddbe3323c613f17a115db23927828f2a8586

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