Malicious PDF — malware analysis report

Static analysis result for SHA-256 56edd2fa3e736a50…

MALICIOUS

PDF

77.6 KB Created: 2021-04-16 13:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fddb178fcda5406c5251dd7ff24fdaf2 SHA-1: 28075d9fa87dd3b3e9af1731672f52134aa2cac0 SHA-256: 56edd2fa3e736a500b7349c5cb5ed686e0cadbb66920efac35e6dea7549170dc
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or malware distribution. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV and an ML classifier also flagged the file as malicious, specifically as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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+know+if+my+apple+watch+is+waterproof In PDF document text
    • https://zatozidebowetam.weebly.com/uploads/1/3/1/3/131398213/b7a232.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/tujezonovoma.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/oPhaqji/rewards_reading_program_lesson_plans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_5fe6f5fd94800.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/hibhgig/class_6_science_ncert_solutions_chapter_9.pdfIn PDF document text
    • https://zigibopujomez.weebly.com/uploads/1/3/5/3/135350997/vubiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/8bCggcP/jojoresusefepowob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_6010f38994706.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/ichdugd/rarobowuxerudegixadafuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_606aed87cc0c5.pdfIn PDF document text
    • https://vupokidenug.weebly.com/uploads/1/3/4/6/134699393/85f4b0977fd80c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_604b36f8ef9eb.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/Zq2JWBq/23471672672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_603f04e14402c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_601743d46e122.pdfIn PDF document text
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/f60454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_604e192ec80d9.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/6707311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_602c5fcd915e7.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/4c523107-132d-4778-b032-128db114b969/what_is_the_study_of_public_relations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845127bc-c494-43f1-a710-072dae672fce/nefiwokegigofawelefova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438cf213-e7ed-49bb-98fe-401615c8c148/lekipasirud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a8d634-a54d-43fb-8660-006349b3b271/32060913719.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_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 5476 bytes
SHA-256: 19624b3825502aa1e2e445ef524b84b33db8df0c4ef452de22600aa174a294ac
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 11164 bytes
SHA-256: bd1b7dec06826acb07570197879148a65cdace2ac53c44770184f42767cd3fdb

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