Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48cf2eb494f37a2…

MALICIOUS

PDF

79.0 KB Created: 2021-01-01 02:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0810b687bab04708666cecb0c26a0a31 SHA-1: 7d202ff17a812a7680079bec1859389e39c8ca54 SHA-256: e48cf2eb494f37a2ad532a22f64e877782164d7f152df15c8f9eee90bc602397
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=riddle+school+7 In PDF document text
    • https://dubezotamepaloj.weebly.com/uploads/1/3/5/2/135297843/binowuwijupupo_zubufomasonulat_sixob_fogolu.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/risumixexiwaja_gavufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5fea275959eac.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/xufululifuz-sumisabizajuve-vigotog.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/232f5246726a.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/6594843.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/jewupubul_kiminex.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/ec18f660-5244-47f8-bccd-d065489cbf95/wumolatuwin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3969d64-fcfc-4f72-9598-0b361ee3882d/imagine_big_terri_savelle_foy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c8e1c8-e264-4d29-b06b-811ff1a39420/leadership_exercises_for_college_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8441dc-b91b-420a-a115-a4979593e3ec/sinopsis_jealousy_incarnate_ep_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273b6000-7b92-45f4-b1ee-ad90692072bc/kopobitupizegomikosugar.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_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 4808 bytes
SHA-256: 343f83558c1feedc6c45a02ca41eac4f989087ed5416a6c7214ff58f65d4bdf4
font_01_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 11128 bytes
SHA-256: 097b776355c618310f1a10a02f86d42354754d2b4bcc1a0f11ebbe1c07037ff0

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