Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68c18aac92aaf2a…

MALICIOUS

PDF

75.5 KB Created: 2021-05-24 05:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a394ef3fbf33d2ca7991bef9d61d4671 SHA-1: d0cb3f4424decbb8257288315c05c3bdfdb61b1b SHA-256: c68c18aac92aaf2aa25888712aecfd7e5340d572c339ec455645e4ec44b9549a
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=dell+optiplex+9020+sff+motherboard
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c0a38c65-0fcc-4403-b5ff-f702c9db8c4d/49333276692.pdf
    • https://s3.amazonaws.com/rizijubovapuk/47773738031.pdf
    • https://uploads.strikinglycdn.com/files/8e6986d9-534d-4f73-b454-8451452960b9/how_to_reset_hp_pavilion_dv6000_laptop_to_factory_settings.pdf
    • https://uploads.strikinglycdn.com/files/e03b7b6c-b8d2-42fc-a046-5072e0d1d9a3/how_to_insert_a_into_a_word_document_as_an_image.pdf
    • https://s3.amazonaws.com/zafirawit/candidate_interview_evaluation_form_word.pdf
    • https://uploads.strikinglycdn.com/files/95ffa4d0-1b27-4050-bf87-2ee41080464b/4798468250.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/koxojewumanukufet.pdf
    • https://uploads.strikinglycdn.com/files/62fe977c-4f9c-4f15-8a78-d91adea97cb4/2006_chevy_hhr_service_manual.pdf
    • https://s3.amazonaws.com/sedowedi/chocolate_dapple_dachshund_puppy.pdf
    • https://uploads.strikinglycdn.com/files/dc1bf432-6e22-4bbf-b029-c84b7cae62e9/does_nora_kill_herself_in_a_dolls_house.pdf
    • https://s3.amazonaws.com/vovopafubipu/vertical_garden_design.pdf
    • https://uploads.strikinglycdn.com/files/7191e95c-9d76-4544-8bd3-c71d7398b76d/acer_aspire_one_722_c6ckk_specifications.pdf
    • https://uploads.strikinglycdn.com/files/9d90a681-09d3-4fb9-8465-b9848d83b6bc/marketing_plan_example_word.pdf
    • https://uploads.strikinglycdn.com/files/7b6a4c34-b03b-4a10-abd5-c1defa80706e/is_there_a_recall_on_frigidaire_dehumidifiers.pdf
    • https://s3.amazonaws.com/jedobufudajewu/free_online_mailer_design_templates.pdf
    • https://s3.amazonaws.com/varolexexus/74441790257.pdf
    • https://s3.amazonaws.com/fedufiporara/20840231228.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e931.bin
78db752ee2d1da4f2c5e48518ab5750f114ee45be6c18c6894d8c005d35d8779
pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 5920 bytes
font_01_sfnt_off0000fd2a.bin
be16c0c5f65f97685e5228d72c0f0253b5f0283da1aeba3a6566a0f00bc55841
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 10568 bytes