Malicious PDF — malware analysis report

Static analysis result for SHA-256 a256d2b806592879…

MALICIOUS

PDF

71.7 KB Created: 2021-04-04 06:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a06c1ea01fa65825b58fec25f308d7f SHA-1: df8f522af4e10e5eb2271daa89a3a07e2c66c40e SHA-256: a256d2b806592879e423082bbc05fea2358f8251a852d6e92f89e59330482f49
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 domains, suggesting a link farm or phishing operation. 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 malicious activity, likely related to spearphishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://nipisod.ru/strik?utm_term=how+to+crochet+absolute+beginners
    • http://mokenolovulonom.medianewsonline.com/fundamentals_of_molecular_spectroscopy_c_n_banwell_free_download.pdf
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/busojekakaduwoz.pdf
    • https://tazujunage.weebly.com/uploads/1/3/5/3/135318046/c91c3801b8.pdf
    • https://zimipiboneletun.weebly.com/uploads/1/3/4/8/134894964/891026.pdf
    • http://ogranicbio.fun/my_breakup_diary_imagesbna0b.pdf
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/foxifukabutigawa.pdf
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/606861.pdf
    • http://nipokaxa.getenjoyment.net/tiny_house_building_plans.pdf
    • http://sakhavto.ru/vuwunugepokimidukisibofcjfus.pdf
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/8376884.pdf
    • https://fexatawolev.weebly.com/uploads/1/3/4/4/134445796/ledav_pelulabonuzaj_babivaxa.pdf
    • http://evilcheats.fun/weather_live_stream_hurricaneufvmz.pdf
    • http://pukebebizadolu.mypressonline.com/92986501866.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_4f671b48794f4cf7a2d32e9e5136adad.pdf?index=true
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_55fbf4f9607b48b191d3aa2d39f55eb8.pdf?index=true
    • http://piwolimosopobu.myartsonline.com/zagupameviterulufudotef.pdf
    • http://gitavini.epizy.com/cap_definicion.pdf
    • http://lavapokapajemob.myartsonline.com/surah_al_mulk_arab_dan_latin.pdf
    • http://pemuwosefewe.epizy.com/41677540005.pdf
    • http://nejojepu.epizy.com/16222683061.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_off0000dbda.bin
b5e7a7911b82c9ecad607891a50d07476619e8fe6172688d36272d91ae04f309		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 5252 bytes
font_01_sfnt_off0000edc1.bin
6073353210936cdfc4d86f6636b0e3d728dbcec818762147832d4e3e81c3dc63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 10436 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.