Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d7f2aaea915e59…

MALICIOUS

PDF

66.7 KB Created: 2020-12-24 04:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 427b5b80b19a95ed5fb4ead5c328dc08 SHA-1: e218eb2a78096b6f44626b68849408d858de11e0 SHA-256: 37d7f2aaea915e599e411ee695a46c1772b89009115ea1fa962e966f923379ca
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external PDFs hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The presence of a malicious redirector URL and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. While no scripts were directly extracted, the structure suggests a phishing or malicious content distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?utm_term=endless+traffic+race+2020+real+rider+highway+project In PDF document text
    • https://tiguxenejizowi.weebly.com/uploads/1/3/4/8/134899735/lexid-jajimak-boxujelivovu.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/jubadokijoganixu.pdfIn PDF document text
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/donuj_piludeg.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/xiwiwejinumif.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/motanizo_xudan_kijemifizarufi.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/kixobina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_5fab26376bdbd.pdfIn PDF document text
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/zigofudexojiv_gixetivenoze_zadoret.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/d154e5ed-75a0-481e-a98f-bb588fe9ed1f/entry_level_financial_analyst_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df922f2d-bde8-4049-bf30-1bf8bee008ab/how_to_access_bsge_email.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/2_week_boiled_egg_diet.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_off0000c5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D4 5916 bytes
SHA-256: d19773d2da1b210d9369fea567edfa7b811e2be2e35755eb7a1c8244db48ffac
font_01_sfnt_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 10464 bytes
SHA-256: b0130faee4c37ab167a36267a43b9429e8235a10301eb215864605d1307436b2

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