Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c083a33e746cc3…

MALICIOUS

PDF

75.3 KB Created: 2021-03-14 01:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7e5757955f7f00e44d91326ed0723ed3 SHA-1: cb0592591391beeb1eceb66f1a35ff90f04b62ce SHA-256: b5c083a33e746cc33dd83a68bd29a1a5480124b0bd17dee3fca1094d34f4f481
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for phishing or distributing further malware. The embedded URLs point to suspicious domains, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=football+heads+game PDF link annotation
    • http://seomagnat1.online/honda_ruckus_gy6_engine_for_saleuc60u.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/9UjbhbQ/notuvux.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/jfljcif/joffre_marne_1914.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/bhfygdF/halloween_nail_art_designs_2019.pdfIn PDF document text
    • http://tiktoktop.design/wirigamomudurapov1elgt.pdfIn PDF document text
    • http://gromstroy.com/dukepikororudepakajapsw2m3.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/dWharie/68135296410.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/gEghjcO/toilet_runs_intermittently_after_replacing_flapper.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/fMYhchj/julorazusegejejinoroji.pdfIn PDF document text
    • http://konsalting.info/28420980035ugjev.pdfIn PDF document text
    • https://cdn.sqhk.co/nofevemumidu/chIzqhf/9732564669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_254ee376ec9d48bc9a4f3f25430f4a41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/83789797143.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/microeconomics_sample_questions_and_answers.pdfIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_688f3341385c40a3956dc177ed849ce0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/battery_calibration_without_root_android.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_cfc6fc0b28324d118e3ee66380b9f99c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/32568763215.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_d176eb1e0ed040b8a8488deef8284073.pdf?index=trueIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_8f541629538446aeb6e286a9d29408aa.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_2679529ef6a840a28d9a6fba38db0126.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_5ce12423a15e4cbab8fcb75c5082ad7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/bananas_nutritional_information.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_dc0501d3e356442db16c18d5e0ddf9bc.pdf?index=trueIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_dd664e94bd824712a60c80cca6bcabf8.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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 5240 bytes
SHA-256: deeca7fde64b47ab87af37b96dd93042c84ebca0afba5d631d6594c4cabb092c
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 10816 bytes
SHA-256: 494afc1553b0192fca6a657bd977430cd480870d72cb9071ff718a1141ae335b