Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb96686d0c69067…

MALICIOUS

PDF

73.6 KB Created: 2021-01-24 17:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 987e114385c23d41fbd06a8d05c70a88 SHA-1: 7cb5bcaa2d23f282936f093f7d79c141bdd58fe1 SHA-256: cdb96686d0c69067dbbd724954ea273be9ec97310379d3184a33980aa161400b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded URLs that redirect to suspicious domains, likely intended to host further malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to 'exchange rate worksheet with answers', aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?utm_term=exchange+rate+worksheet+with+answers PDF link annotation
    • http://ovca.space/345007100977qjoq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5fce95a957b6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447436/normal_5fe3b21c139a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_600d79d51d26c.pdfIn PDF document text
    • http://idealicait.website/zepekosinadaniwiwafidoba6r5bs.pdfIn PDF document text
    • http://teachersaid.fun/lowibewabowotidetilokonop0ct.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fefaa7953a19.pdfIn PDF document text
    • http://shtancircul.site/90793100913kzac9.pdfIn PDF document text
    • http://sellamorem.com/gikefosabunerigamifimok2q2t.pdfIn PDF document text
    • http://remont-pc.website/62162937552ae822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489713/normal_5fe76b761fd99.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/best_craft_beer_subscriptionqls8z.pdfIn PDF document text
    • http://zeropium.com/538872060519q2h9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_5fe9fae9b839f.pdfIn PDF document text
    • http://qrastenmap.online/the_walking_zombie_dead_city_free_downloadbybqs.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/robumuduluwise/chennai_city_road_map_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/bfa_cooking_level_up_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/xazamo.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/ranipidewopexotiwilenisen.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 6

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_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 5208 bytes
SHA-256: be0feecedd398e724358856f4eb85c249620663347abdfca52c2cc320275a936
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 10736 bytes
SHA-256: e1d21e3b9bea066d5529a10b091c7f80ff3107caa6055d4463f9585ab421729e

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