Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e75ef4d86e37640…

MALICIOUS

PDF

82.5 KB Created: 2021-01-08 17:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 531487f7432732496322ebb3ab50f9cf SHA-1: e934c346e8484ba13690a7c76b838044ba986d24 SHA-256: 6e75ef4d86e376409836af5ca32833485dabde315b31200fa4df394a262f71e1
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=adobe+indesign++cc+2015 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4412391/normal_5fee8d45ec1d2.pdfIn PDF document text
    • https://rozonamofo.weebly.com/uploads/1/3/4/7/134751518/gugotubafixuf.pdfIn PDF document text
    • https://zemaxuwoti.weebly.com/uploads/1/3/4/6/134694437/858685.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/bikiwufirol-fubub-wozonepuven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_5fe693b727895.pdfIn PDF document text
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/masosuwijinis-mepome.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/05e540f52da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5fa601e598b3a.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/649c5b93-c479-46ba-9705-0080018537f1/nuwogube.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/easter_island_moai_read_theory_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f382324-29d9-4818-adb9-2d3d99f05d77/1675195209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1eb3b6-281b-48ae-a174-d0e906b1f081/zagoxowanuziralegixalitin.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/blank_timeline_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616c6f41-d9c8-41e4-863f-4412dbc3a9c0/18051724744.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ecfd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xECFD 10448 bytes
SHA-256: 1a25f69a1cb41b6d09387a5c22f41bad54cd581cb59f95d8671b25c990db9af3
font_00_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 5056 bytes
SHA-256: 5e28b3fd82b553e90b7106135e4d996b8d693868d73d179f8c7169934eeef453
font_03_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 10960 bytes
SHA-256: f76dc8ed77d181b6bffc1875b24682dacfbc914edc81ed92b563f86d5c8a623e
font_04_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361