Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d5caab9bbdebba…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 09:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa4eb2a379a3b432a8cf391de60d846e SHA-1: 3579a41c97028261c414e42500fc8ec7a4716d98 SHA-256: 14d5caab9bbdebba44eb079d278b7d5e5cbbddf51081102361c23786e8d448ef
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to search terms, further supporting a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://lozipotod.ru/123?utm_term=vegetables+pictures+with+name+in+english+pdf
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/kunaxoxaxerarufuver.pdf
    • https://napepoxamugif.weebly.com/uploads/1/3/3/9/133997580/tixilog.pdf
    • http://classkaod.ru/how_do_u_hack_a_vending_machinefzq4p.pdf
    • http://remont-kholodilnikov.website/what_happens_when_photons_are_absorbedfi2qp.pdf
    • http://baffer-shop.space/vezepebugekiw9dgp.pdf
    • https://sipobazi.weebly.com/uploads/1/3/4/4/134494275/8040295.pdf
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/204719.pdf
    • http://endi-itali.space/sens_multiplication_ce14a42l.pdf
    • http://kopumiwabetare.66ghz.com/gesubibopunu.pdf
    • https://fimuvuxufubewi.weebly.com/uploads/1/3/4/4/134442536/xagif_tukepotofozesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/limepusotanal/24517393422.pdf
    • https://s3.amazonaws.com/liwafo/79105486095.pdf
    • http://xudivimenifidu.rf.gd/16969220229.pdf
    • http://jevodowe.rf.gd/majojosusalig.pdf
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_c398dd2e066a42b18f4aca9072b82494.pdf?index=true
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_0998361798a9471890cd7757b9edb9f0.pdf?index=true
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_cf389cbc4f03466dbfde60761eaaa865.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_e6299767d0594bfeb9c64893dac154b6.pdf?index=true
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_1d6612890a2f4793a570f45a3f916786.pdf?index=true
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_d99fea9107864739b1a47f296a72b548.pdf?index=true
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_e8235d23a6464353983e27407b1ab279.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea65.bin
60a2aa96fb153e2e73918f739efc5eab3a694e3b8bcf03f130310509715c4ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 5536 bytes
font_01_sfnt_off0000fd13.bin
7c3a0468c5a1b0c4cb0c759ca3b086ad5c3d9d28bbaddca0988f734072e9bbde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 13360 bytes
font_02_sfnt_off000128fe.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 4324 bytes

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