Malicious PDF — malware analysis report

Static analysis result for SHA-256 36caf767898c305e…

MALICIOUS

PDF

78.3 KB Created: 2021-04-02 11:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fc279dc6d5df8cf7342957602fc5f64 SHA-1: 59a53583ada75a180938dfc8679be51e4b6a40ea SHA-256: 36caf767898c305ea9422a83f087a6c501079e85f0c1cc326aadce2ceb3d6029
176 Risk Score

Malware Insights

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

The PDF file contains a lure related to a product recall, directing users to a suspicious URL. Heuristics indicate a link farm and a callback phishing lure, suggesting the document's primary purpose is to redirect users to malicious sites for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jottigo.ru/strik?utm_term=danby+premiere+dehumidifier+ddr5009ree+recall
    • https://cdn-cms.f-static.net/uploads/4468550/normal_602b4a5523ce2.pdf
    • https://zetokefukakebep.weebly.com/uploads/1/3/1/4/131438441/nititadikotixu-sokeriza-tirugupu-rabujif.pdf
    • https://cdn-cms.f-static.net/uploads/4454290/normal_6015293299925.pdf
    • https://mumilupoj.weebly.com/uploads/1/3/5/3/135351188/sedexakaberoz_nuzosilegemu.pdf
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/09220e1b818700.pdf
    • https://cdn-cms.f-static.net/uploads/4415526/normal_60464ade89e50.pdf
    • https://cdn-cms.f-static.net/uploads/4478923/normal_6058ea56aaf8e.pdf
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/5764ee59a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7c5b88f6-9de3-47e4-8003-c3e84d33316d/sovimefevolenixage.pdf
    • https://uploads.strikinglycdn.com/files/00ea99d7-4158-4c67-a117-179c1ec56776/how_to_setup_tp_link_wifi_extender_av500.pdf
    • https://uploads.strikinglycdn.com/files/5cb76adb-5673-4f73-8480-c366d49985fb/deer_predation_or_starvation_worksheet_answers.pdf
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_7b5fe4d712f6451db41934f99a598f27.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/how_to_order_sheets_alphabetically_in_excel.pdf
    • https://uploads.strikinglycdn.com/files/1e0fd1fc-c3be-46ff-9674-0f08d8f1517b/15767908085.pdf
    • https://s3.amazonaws.com/tixeligufokup/solved_aptitude_questions_and_answers_for_infosys.pdf
    • https://s3.amazonaws.com/kibavutibeved/9894809844.pdf
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_ce901e717c0a4a4984f02ed54b6a915d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dd260efc-58f5-4278-a155-57880927aac8/how_to_identify_a_child_with_high_iq.pdf
    • https://uploads.strikinglycdn.com/files/087468f8-d4be-49c0-95ca-226177a7be5c/lujezogexa.pdf
    • https://uploads.strikinglycdn.com/files/6c7cfb36-aa83-41ba-b317-5b9a995d8bb0/ap_lang_argument_essay_thesis_example.pdf
    • https://uploads.strikinglycdn.com/files/3b97e6ca-8cff-433d-90a5-ce6b0495131b/78459296651.pdf
    • https://s3.amazonaws.com/gazivemon/cadena_alimenticia_trofica.pdf
    • https://s3.amazonaws.com/dazinibonofobi/21076906922.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e534.bin
b8dbccd4213773797a2cdd0c54b3c5eed9bc29b5db83eb06a22cd0112c37547f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 5572 bytes
font_01_sfnt_off0000f7f2.bin
bb10d6e1b875fad9ff2a8a37d4d4bd47083b8a2380357b4d343778d0254644b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 10968 bytes
font_02_sfnt_off00011d3d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 4324 bytes