Malicious PDF — malware analysis report

Static analysis result for SHA-256 5832ee04068e280a…

MALICIOUS

PDF

74.5 KB Created: 2021-02-27 22:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94b8557b376006b86b310e7b967f8008 SHA-1: 294f3c5e2d3ca74b578cb79ebdf00baaf18e1267 SHA-256: 5832ee04068e280a6821f632821ebb87b36dd4f25ad373b8cc1a94bbedb77407
166 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely leveraging social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ponafet.ru/123?utm_term=how+to+use+random+number+tables+in+statistics
    • http://kapovulup.mywebcommunity.org/simejelujoxerekibe.pdf
    • http://retamos.mygamesonline.org/76760994806.pdf
    • http://fazejajogavu.medianewsonline.com/is_the_equity_market_open_on_columbus_day.pdf
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/8534631.pdf
    • http://worameruvejaka.mywebcommunity.org/45803532974.pdf
    • http://votixibutiro.medianewsonline.com/how_to_make_natural_curls_curlier.pdf
    • http://pifedalune.medianewsonline.com/how_to_fix_jammed_nerf_gun.pdf
    • http://zufunepel.iblogger.org/cheapest_android_auto_car_stereo.pdf
    • http://pifedalune.medianewsonline.com/how_
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvarelo/impossible_quiz_2_question_50_answer.pdf
    • https://s3.amazonaws.com/jijumupade/cape_cod_striper_fishing_guides.pdf
    • http://tavamikilav.myartsonline.com/what_are_the_4_realms_of_the_nutcracker.pdf
    • http://saluwagasa.onlinewebshop.net/39872424960.pdf
    • https://s3.amazonaws.com/lixisariwulo/kali_linux_android_meterpreter_commands.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e632.bin
3e01e0d456ffe5fd45cc881df1170a0b4d6c8765985905c34e01190cddece0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 5276 bytes
font_01_sfnt_off0000f818.bin
3aa45e0e95e32a744ae5351d19a91a97f0a932e2a400b7715537758b50c2fc65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 10700 bytes

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