Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d536285dbf25ca…

MALICIOUS

PDF

83.5 KB Created: 2021-03-31 13:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e614c6a5f84dffe9fd132ba210fa473a SHA-1: 37dade73548483e5c1a79924916ad47f2d7c999c SHA-256: a5d536285dbf25cac9d3df7e6f21abdacc1ac7dd236d1338374de1234ee783f1
134 Risk Score

Malware Insights

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

The PDF document contains multiple external links, with one specifically identified as a lure for downloading software ('ccleaner for pc windows 8. 1 free'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/123?utm_term=ccleaner+for+pc+windows+8.+1+free PDF link annotation
    • https://cdn.sqhk.co/sabiwizi/ZMFhcw7/mejep.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/hbjbnGu/nilobu.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/jfheqoJ/napakogeto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5feb4f15e8cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481406/normal_600ae8655e2a4.pdfIn PDF document text
    • https://cdn.sqhk.co/jalinutaxos/eZGiaij/15314605316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_6011651100260.pdfIn PDF document text
    • https://tepidupelagoxu.weebly.com/uploads/1/3/4/4/134472529/4dbc30173c28d.pdfIn PDF document text
    • http://patavitukazinaz.iblogger.org/rofomapul.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/1jjanid/online_marketing_strategy_sample.pdfIn PDF document text
    • https://tilijaxak.weebly.com/uploads/1/3/1/3/131381787/5053139.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_b630541949b94bec82dfdee576171b62.pdf?index=trueIn PDF document text
    • http://vunaduwijumuz.epizy.com/cyberpunk_red_jumpstart_kit_world_book.pdfIn PDF document text
    • http://sivojosifa.epizy.com/wimekijoraxib.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/15227175427.pdfIn PDF document text
    • http://sejineje.epizy.com/lawogimenuxoki.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/80996201444.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/batufopemisijodegemo.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_71aedb94fa1949d69d32191f84cb488c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/the_lightning_thief_book_series.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_6dd52c7ef6454f49ac75c02d0b13265c.pdf?index=trueIn PDF document text
    • http://dikekonigexixa.epizy.com/76850829383.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 5248 bytes
SHA-256: 1e0c2cfaef2aeda2ac705abdc966a8570dbc8ec748ba75a910d774f9462eae2a
font_01_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 15520 bytes
SHA-256: ce643e28745b9baf3fa1d2b7955348a243d7b03b942eba47dace1e0a3c67efe7
font_02_sfnt_off00013034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13034 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378