Malicious PDF — malware analysis report

Static analysis result for SHA-256 35014b9e62b159e8…

MALICIOUS

PDF

87.6 KB Created: 2021-03-13 20:33:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 33f48fdab3eddd98ccf8803221103586 SHA-1: b19347c6a7633f50216bef321b6e7b82d4826a09 SHA-256: 35014b9e62b159e86fd923a6e6cc059d0e2f2699f54d24328cdb71feeef42088
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, contains keywords related to academic topics, likely used as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://fokemale.ru/award?keyword=osmoregulation+in+amphibians+pdf PDF link annotation
    • https://foxodutamawasu.weebly.com/uploads/1/3/4/5/134587344/povekafisazen_xuxuv.pdfIn PDF document text
    • https://bagibobujinokat.weebly.com/uploads/1/3/5/3/135312275/befut-fonekerusatido-xanesobudusaloz.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/gdOZ7ie/cross_fight_mod_apk_happymod.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/64b0e7b.pdfIn PDF document text
    • http://fullhp.info/jimmy_choo_full_hd_video_djpunjab0h2sf.pdfIn PDF document text
    • https://warasogufav.weebly.com/uploads/1/3/4/4/134440103/figofabore.pdfIn PDF document text
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/tivog_zukusasuwasoger_dajilexug_wizifam.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/c0ba5c24a0e.pdfIn PDF document text
    • https://cdn.sqhk.co/jujijodop/tqV9Gic/vekudikuxidumagusep.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/IjeDNjN/nintendo_switch_games_tier_list_2020.pdfIn PDF document text
    • https://dufurewamefo.weebly.com/uploads/1/3/4/5/134595550/5512286.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/cfiioiN/kuwenokuvamawaw.pdfIn PDF document text
    • http://santaparker.store/aplikasi_browsing_terbaik_untuk_android7qse2.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/JjeZgih/98708734754.pdfIn PDF document text
    • http://shoop-fk.ru/youku_for_pcisqrd.pdfIn PDF document text
    • http://cosmicgig.com/42459374737ohkhh.pdfIn PDF document text
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/mufilo_lomapigelutuli.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/banimifo.pdfIn PDF document text
    • http://shopbest.online/bizufuxenutudimefadwf4ju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_2c2b44f200ed43aab4fe5b81a2da7213.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/47828471675.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_85f58e4fc0ab422b828c4f997a16b786.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/kilizove.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/nijimezesirunubobava.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/kitevezedoguzo.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/gofoxajedeworirovedakejaj.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_d98da31d5d634c12863e7ec4a88c6482.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_922a2d3a932441288214567cfbf7195b.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 5620 bytes
SHA-256: e01bf299658fde2fdd2fad2cbcd80fff3898754525e74c0b5827269157c38861
font_01_sfnt_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 10576 bytes
SHA-256: c5873003a29cd6fbaa06240e24a937d880d2f7445a919761330d74a53456bf23
font_02_sfnt_off00013ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE1 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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