Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb69391c4c6c28c…

MALICIOUS

PDF

81.7 KB Created: 2021-03-28 20:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9794d14cdabb14ba2eee5702602aea89 SHA-1: 03f3651a8c3f42fef8cb312be9f6f730c03656c3 SHA-256: dcb69391c4c6c28c76b6c37d1d08ebd9f778a61d6f0b352f8c915038ca623d11
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 designed to manipulate search engine results. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/wix?keyword=properties+of+cellulosic+fibers PDF link annotation
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/rifitixowirubov.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/c81b0e.pdfIn PDF document text
    • http://creditscorecard.info/tiwugukovoxasaje0lj7e.pdfIn PDF document text
    • https://disesusobabetom.weebly.com/uploads/1/3/0/8/130814900/6d63302c1584.pdfIn PDF document text
    • http://mavito.online/sword_slash_sound_effect_free_downloadfibag.pdfIn PDF document text
    • https://tugunopoxakisif.weebly.com/uploads/1/3/1/3/131398472/xikegufudi-dinesu-folepasikigiz-somuwi.pdfIn PDF document text
    • http://kukushpa.fun/aditya_music_telugunkv1m.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/balexiteraxevubi.pdfIn PDF document text
    • https://folodekoj.weebly.com/uploads/1/3/2/8/132814523/2992993.pdfIn PDF document text
    • https://zibezalobe.weebly.com/uploads/1/3/4/5/134529300/tilaro.pdfIn PDF document text
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/2327229.pdfIn PDF document text
    • https://fanakigefepawaf.weebly.com/uploads/1/3/0/8/130873796/ae9a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bezegoluzose/black_raspberry_ice_cream_cake_recipe.pdfIn PDF document text
    • http://mibesajaku.epizy.com/christmas_lights_coldplay_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/79218526568.pdfIn PDF document text
    • http://mevanuzexujen.rf.gd/zevitidatewosajumazazu.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/beyond_the_clouds_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/50_shades_of_gray_full_movie_hotstar.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/acer_chromebook_15_cb515-1h-c1vs_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/what_can_fluid_dynamics_be_used_for.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/bill_of_sale_georgia_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/msi_970_gaming_lan_drivers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 4716 bytes
SHA-256: 1087680eb5a3a35ed76ad7f147a4b9c7852f01ee5bcc929d9b497c1e3d52934a
font_01_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 11188 bytes
SHA-256: a8e4e566aec371b0a6965c4719996d23dd918e6b3658c8867b64e0981a4c0f00
font_02_sfnt_off00012ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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