Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3672531f8c05712…

MALICIOUS

PDF

80.4 KB Created: 2021-04-25 05:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0ea64b8725ed7db09b876c1a6feccb87 SHA-1: 30d61336e60b175da3d678d8a6a9bc17320b02bb SHA-256: b3672531f8c05712d71756b72e3a2950d4c194b66bcbd0fa9889356077284c29
186 Risk Score

Malware Insights

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

This PDF document contains a lure message suggesting a "Wd my cloud file system check failed" to trick the user into clicking a malicious link. The PDF is part of a link farm, with numerous external URLs pointing to other PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://xajibur.ru/strik?utm_term=wd+my+cloud+file+system+check+failed PDF link annotation
    • http://interbankdigital.com/dilesesivadedaxogiy1lzr.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/shjhiid/vabekewusaberisamebinijej.pdfIn PDF document text
    • https://nikevafojo.weebly.com/uploads/1/3/4/6/134680040/balibuzubadodo-sakadovari-mewawevilumarod-fizajuparobod.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/0P6TheY/nutrition_information_white_mushrooms.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinirumawe/jgnjjAA/idle_flower_tycoon_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/0ibgigh/lamy_safari_red_rollerball_pen.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/panit.pdfIn PDF document text
    • http://hardcreditcheck.info/how_do_you_turn_on_the_i_pilot_remoterze2e.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/giajgKb/royal_caribbean_cruise_sailing_again.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/hcIgjdc/qr_scanner_samsung_j7.pdfIn PDF document text
    • https://pimabebobi.weebly.com/uploads/1/3/2/3/132303226/bdf46c557.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/setikizo/55271000409.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/72677602517.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_28f804d552114ba5bade36699d725085.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_f4a0083bc6634bb8af49979ca8afefdc.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_4a02206f532e4d858b2f127cd9b4a308.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_bb4e2477a342457ab85a9e20f7a142d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/diabetic_neuropathy_treatment_guideline.pdfIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_3df25288b47e4c9a8ba5622aa7aaaf18.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 5344 bytes
SHA-256: a77be6b49b4a8fa77d79a332ffa1ed553f430da13cff645e216b84a3c289c18b
font_01_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 12120 bytes
SHA-256: 27a6f6943536b14607b1bcb3c21b79b73ba140a1736d5d88608cfa832c5bc39a

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