Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f75120c63ee8d6…

MALICIOUS

PDF

96.8 KB Created: 2021-03-23 14:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b532fad10999294d70f94efb25f3fd8a SHA-1: 2242a299d21df51eb19e2fd5bebaa6bfb95110cd SHA-256: d1f75120c63ee8d6ff4fdb109cca6b07d8446e7a2dc10908ee5bcb064657a65c
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a significant number pointing to disposable hosting and employing UTM parameters, characteristic of link farms used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://dafemum.ru/strik?utm_term=10+difference+between+trade+commerce+and+industry
    • http://foripekomufotir.mypressonline.com/30941587227.pdf
    • http://wisitens.online/475017402758nknf.pdf
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5fffb781afe73.pdf
    • http://rozel.ru/what_does_e7_mean_on_air_conditioner7qfs5.pdf
    • https://cdn-cms.f-static.net/uploads/4420039/normal_603a994950020.pdf
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/a24f27cb4a7163.pdf
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5fc5ab25ad1db.pdf
    • http://tiriruno.sportsontheweb.net/administracin_de_empresas_libros_gratis.pdf
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5feb4144b2dde.pdf
    • http://buxeletifexid.medianewsonline.com/apc_back-ups_550va_ups_battery_backup__surge_protector.pdf
    • https://tomovomat.weebly.com/uploads/1/3/4/6/134617768/a08dcc46a5fe9.pdf
    • http://itanto.space/kaiser_rn_new_grad_program_2017u2xz9.pdf
    • http://rodina38.ru/jegexaxox53iz.pdf
    • http://daddytestit.xyz/66814497251thow7.pdf
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fcbd04a0cdd1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_8f331e557aaa4808928443ee6f5bf4dd.pdf?index=true
    • http://tefadipa.epizy.com/evinrude_90_hp_v4_outboard_parts.pdf
    • http://karusanisuverob.rf.gd/business_english_book_for_beginners.pdf
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_61da04011c6b45ef872758a39fd54b5a.pdf?index=true
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_e7f4ac522f4c40c1b2524bbeb97fe8e8.pdf?index=true
    • http://zodexalanokaxaj.rf.gd/mujurapabusizulipako.pdf
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_f3e090d9b42d484ba0253b706591d549.pdf?index=true
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_9951474b94554bb3838ee183ea07e3f0.pdf?index=true
    • http://jobifizokugo.rf.gd/wonderland_meme_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d85.bin
42e8061d28d5578b958815cb79e6a361834c0f6f61069f9a6e5a22c41fdaa57f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D85 5452 bytes
font_01_sfnt_off00013ffa.bin
26132d8816a1ce2eb82256a84e9bc0eb50e692e36fcfedd54557a51303f943fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFA 11544 bytes
font_02_sfnt_off00016714.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16714 4324 bytes

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