Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e3724477935777…

MALICIOUS

PDF

81.6 KB Created: 2021-05-31 18:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 36709e7169cae5cd0a403c0bc311a004 SHA-1: 6b4189d19f6955847a00d768c1d86b4c8ae144df SHA-256: 40e3724477935777a27c3308129772c16747263403aad503ce5cb13a57cd8133
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chcial.ru/pbw?utm_term=cuanto+es+un+metro+cubico+de+arena+en+kilos PDF link annotation
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/6735764.pdfIn PDF document text
    • https://galewijukinez.weebly.com/uploads/1/3/2/6/132695540/gifim-kaxokinosez-dusaxunefomuv.pdfIn PDF document text
    • https://sipimivib.weebly.com/uploads/1/3/4/6/134657766/vidolubelo-wogufuvuwa-ridakepufer.pdfIn PDF document text
    • https://momitoxen.weebly.com/uploads/1/3/7/5/137514133/8816751dc85fb0.pdfIn PDF document text
    • https://pufopobumosuv.weebly.com/uploads/1/3/0/7/130776602/vakiba.pdfIn PDF document text
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/kulutovagep-nagedazir.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/231c84e9.pdfIn PDF document text
    • https://sojuseruk.weebly.com/uploads/1/3/4/3/134367588/zadaro.pdfIn PDF document text
    • https://talaxekagaros.weebly.com/uploads/1/3/5/3/135347480/8688350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_600b75457f496.pdfIn PDF document text
    • https://lupogupep.weebly.com/uploads/1/3/4/4/134444844/3920076.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://uploads.strikinglycdn.com/files/c1d0ca26-eaba-48ca-97d8-0ee669a163cb/what_best_describes_the_overall_theme_of_the_wife_of_baths_tale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62580b47-dac5-4268-8c21-3ba2f503cc95/how_to_start_trading_online_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bc5dc3-56a8-4438-8dba-f3fe9a1db07c/31956594901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4650636-5244-449a-82c7-980e182ae56f/why_is_my_att_uverse_remote_not_working.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/download_harvest_moon_fomt_gba_bahasa_indonesia.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/how_much_does_it_cost_to_file_a_quit_claim_deed_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9449b29d-2cae-4717-955f-03fd395ad002/88758778079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b4abeb-b1f2-4fd3-a085-f31892508f05/54345535165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4f0cfb-0e59-4d03-be7f-d71d7455a4d1/52354137920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8aaa864-3334-413a-8751-502c41a2a507/23567649334.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144414729/types_of_register_in_english_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f543a0ce-c915-4065-a39c-c6a974ae07ae/gizatamavenidenelexex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bbf7989-10e0-4c07-8e49-fc362e4a27de/duginujemarerogiro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5196 bytes
SHA-256: d164367cf6f5bfdbabff4936a15b9cfba7571e216c94964ef6486bd2fdb5b3b2
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 1936 bytes
SHA-256: 246569b5fd7226bd0ebf3c016de7ba0bf82e996896d660a08030b2af0a08efd3
font_02_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 12068 bytes
SHA-256: 3a3496de3d5709dcdc4a44aae31e0e366a9c0f05d5fcce336ad91ff8a094f708
font_03_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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