Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c272a8920f39a0…

MALICIOUS

PDF

86.6 KB Created: 2021-04-07 10:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d968fa5093f4dede828ed1755adcfef5 SHA-1: 515d4f862560f6a90fef7bb6fc2679990b836767 SHA-256: b8c272a8920f39a053ef07bd320c7d9d663bab85df0c3ff1cddc43e89ea500d4
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to link farms on disposable hosting, suggests a phishing or content-luring mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, likely to obscure the true destination or to host a variety of lures. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites or download further payloads.

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
  • 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://golowaki.ru/123?utm_term=perimetry+interpretation+pdf PDF link annotation
    • http://zopokujejisolan.getenjoyment.net/bafanimalufozubozumobuwef.pdfIn PDF document text
    • http://urott-hu.com/tartl_ortalama_maliyet_yntemih8ut4.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/practical_hemostasis_and_thrombosis.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/aDoRE4D/crush_the_castle_2_walkthrough.pdfIn PDF document text
    • http://flowerport.store/64068846342qgcjn.pdfIn PDF document text
    • http://superheatbelt.xyz/jason_and_the_argonauts_2000_part_1di2eb.pdfIn PDF document text
    • http://myshoes.moscow/the_dolls_house_summary3n4vc.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/rovoxuxosodalalilozi.pdfIn PDF document text
    • http://setofexperience.site/8675702638hbttr.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/pjbCghd/fifa_world_cup_brazil_2014_video_game.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/google_account_search_history_delete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujumek.myartsonline.com/fifty_shades_of_grey_netflix_usa.pdfIn PDF document text
    • http://pawepeg.atwebpages.com/67826922842.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/92792203672.pdfIn PDF document text
    • http://xamukipadu.myartsonline.com/polyclonal_and_monoclonal_antibodies.pdfIn PDF document text
    • http://gozudil.onlinewebshop.net/alberta_bill_of_sale_fillable.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/fujerided.pdfIn PDF document text
    • http://wareguw.atwebpages.com/wodej.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 5080 bytes
SHA-256: ceb5ac8f5deb0d5fd2fe6799850c949f74750b9de132883621ee5ce44d228b16
font_01_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 11432 bytes
SHA-256: d0e9c137a884f436228b435ca755a2a716697bc845ef0315dcc8c83925297d90

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