Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8c50c1db97eed3…

MALICIOUS

PDF

78.0 KB Created: 2021-04-13 15:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4c4d71f72446116efe782f39a16c363e SHA-1: 774c7be90f34a405e0ab9f49aaa74d93705a4df7 SHA-256: 6a8c50c1db97eed341b964dc51bee2b2bc1dcc3f7c3e4a25810112ec75f6eedf
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external websites. One critical heuristic identified a link to a known malicious redirector, and another identified the PDF as a link farm hosted on disposable infrastructure. The ML classifier also flagged the PDF as malicious, and ClamAV detected it as a phishing trojan. The document body text is heavily corrupted, but the title suggests a lure related to cooking, which is likely a pretext for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+can+with+a+presto+pressure+cooker In PDF document text
    • http://zemesod.getenjoyment.net/pes_anserine_bursitis_patient_handout.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/identify_the_principles_and_elements_of_art_found_in_sculpture.pdfIn PDF document text
    • http://lukanovetefitef.22web.org/iso_corrective_action_form_template.pdfIn PDF document text
    • https://juzunuxav.weebly.com/uploads/1/3/4/3/134316531/moxukadopuleda-tomepizegow.pdfIn PDF document text
    • https://vasalidut.weebly.com/uploads/1/3/0/9/130969475/5744206.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ddd2631-58c7-464c-86d0-a5d1d8121c04.filesusr.com/ugd/301b85_a548144489634b628c5ef5e0e9980f8f.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_c51c05ee9b8d49f0b036a21556f4d564.pdf?index=trueIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_597a5eb00d6b466da9091e6a35e495fc.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_b7c6d7feb40242a3ac33ecc2e8838a07.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_60f6ff43ff95421c987871ad12d41b15.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_fd671fdf54974749ac0165271646e490.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_ee6a70ddfbee4b86a74a764abcbbd047.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_77a48f520d3c4d51a4a7ae2847d1adde.pdf?index=trueIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_349e5d5628a04d63a24de6275a881397.pdf?index=trueIn PDF document text
    • http://gesasodalunaka.epizy.com/canadian_visa_jamaica_application_form.pdfIn PDF document text
    • http://temitiz.epizy.com/59075188589.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_70fe7ce4c22a43aba4d94555c6e570ce.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_615d3cf08a15401e8bf07042e265fa9a.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_de837f49e84641669763027820d82070.pdf?index=trueIn 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_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 5108 bytes
SHA-256: cfec5697affa169d650131bd3b24177160d5b572854fed8a08f778c86a68f386
font_01_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 10940 bytes
SHA-256: ec47079d7c0e222ef3d24ca1c718b3dad048f36b8bebd45a900daca09656e51c

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