Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecbb176b6642d95…

MALICIOUS

PDF

76.7 KB Created: 2021-03-11 15:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01840e2bdf38fe20a96c76d03718313a SHA-1: 434040e5778a5389aa7541bcb38beef32c3ca964 SHA-256: fecbb176b6642d95750b4e336ba789bec8960b4ad85bf7b44739da085fe241c5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Adobe illustrator cc 2020 pdf' and 'wkhtmltopdf', suggesting a lure. Crucially, a heuristic identified an instruction to disable security software, which is a strong indicator of malicious intent. The presence of numerous external URIs, some pointing to disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://bologen.ru/award?keyword=adobe+illustrator+cc+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5fd8f2ae78819.pdfIn PDF document text
    • http://vegimawubukuwon.22web.org/which_paladin_oath_is_best.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5fe159ba106b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449766/normal_60062a7222a09.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/zoo_atlanta_map.pdfIn PDF document text
    • http://tozepefaj.iblogger.org/54193170962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5fd33b8c8204c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_60432576a88b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451575/normal_6042c694cc368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5feded5a442c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496193/normal_603f380ee34ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_602411f17f4e1.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/timadovutuwasazixibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zowibatev/fender_precision_bass_serial_number_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/85873630752.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_07b0af1a79294932a415891e2714447c.pdf?index=trueIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/58419856526.pdfIn PDF document text
    • http://pakebixulo.epizy.com/carbohydrate_granule_formation.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_2fed4f75b61e47dc8d25867f977580df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/best_internet_er_for_android.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_f730567962ae422f9c4b96ab79af6973.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/44224864168.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/angara_dangara_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/gofojizelibigu.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/permutations_and_combinations_maze_worksheet_answers.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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 5552 bytes
SHA-256: 9c05a81eeafcb1d76e222c7bf2fca6639cb63c5c96280f28b159c3731f880b94
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 10432 bytes
SHA-256: e0af35a47cfa2e04645568bed8e6529d6b6c931c76f72decce005b06ac2e7b58