Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fafc494cee6ac0b…

MALICIOUS

PDF

100.1 KB Created: 2021-03-09 08:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 66571dec60c99db27423deeb9496b86d SHA-1: a8eba36d86d4d33fd70be8112a0e53eab403b929 SHA-256: 2fafc494cee6ac0b9c982c7526fb049905bf0cd77d4a0f018aa9d5bfac1f5009
126 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 PDF contains numerous external URIs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kuzutuzo.ru/strik?utm_term=co%2528h2o%25296+br3+name PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491164/normal_6017237d9683c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5fdebef68abba.pdfIn PDF document text
    • http://fepotarugagi.22web.org/38798000463.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/eeij4he/general_knowledge_quiz_questions_for_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/ruselaguzoda/GjeNPx9/87440188436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_6011f08267233.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/6geWv20/skins_2017_movie_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/hebfihg/diamonds_imagine_dragons_traducao_natural.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_604412b88a5e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427076/normal_5fed6147b1bc6.pdfIn PDF document text
    • http://bediwiluzosu.iblogger.org/jozidedawun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601f551174704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5fc87b2d45fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_6019ac0051f83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/87671f80-c7bc-40e6-87d3-0521857ca1d2/what_does_a_boiler_technician_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea33460-0fbd-4389-a165-48dab3706a7b/61054650586.pdfIn PDF document text
    • http://pujixedigegogup.epizy.com/metformin_er_500_mg_b115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc95f9fa-297d-46e5-855f-bb0a15980e07/govivipise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163aa2d9-353d-43d2-8647-00950ae5df46/ridapakaveti.pdfIn PDF document text
    • http://kiwusegofavuto.rf.gd/cfa_curriculum_level_1_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebc570a-6b01-433d-98a9-43c3d1cc489c/tasosojegukul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b91e6c4-ad00-4ba3-8939-652512d79474/wivilelikibomedubodijose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd6da39-6068-415f-9581-51d71c492ec1/62817446701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478f7ec3-ddc4-4de7-b030-26b36b72c578/4th_grade_practice_test.pdfIn PDF document text
    • http://birotizedu.epizy.com/larsen_medical_embryology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d9df74-2c79-4338-bb64-78768930eef4/how_to_install_windows_7_from_usb_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0d6924-7578-418f-9d60-10c5a634786f/90537333536.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_off0001458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458F 5364 bytes
SHA-256: 398e1f9429d27944093550b1390ce04158c09e032cfda3a9a56ac592c6dbcdd5
font_01_sfnt_off000157ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AC 12960 bytes
SHA-256: f4ddb3f4ead9c89e5d9a928ed7b504e482fcb99e90ddca85aad814572e8b75a8