Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c80b4944aeaa167…

MALICIOUS

PDF

71.5 KB Created: 2021-01-03 23:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 059610109646c46a6290b1ec178735bd SHA-1: ee8634f3711b6359e6b62e640b0f9f9dc1ab0235 SHA-256: 5c80b4944aeaa1671cf7f6745d7eb269d03c7a8c0e9a5cedc554cad0b12a1407
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?utm_term=baghban+video+songs+free++mp4 PDF link annotation
    • https://bepewosub.weebly.com/uploads/1/3/4/4/134445398/jubapel.pdfIn PDF document text
    • https://xunowivoratidom.weebly.com/uploads/1/3/1/6/131636824/katowosag.pdfIn PDF document text
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/98170.pdfIn PDF document text
    • https://cdn.sqhk.co/mekekomubun/QStsTjc/rubber_chicken_mask.pdfIn PDF document text
    • https://geruzusuvar.weebly.com/uploads/1/3/0/7/130776720/paloja-degepe-bododebikab.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/bbIkkji/78914824592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465397/normal_5fe33adb53ffd.pdfIn PDF document text
    • https://mozipode.weebly.com/uploads/1/3/1/4/131437967/siwuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/android_tv_box_apps_free_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/podoporisaduzibokiwulobis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a56c6e-9ea4-4b5b-a94d-358cd398ac9f/wutigegofolovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb16a001-d394-4b8e-9400-b5bfa41e09b7/dce_senior_high_homepage.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/gasket_material_sheet_for_sale.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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 5760 bytes
SHA-256: 22ae7d128901194ce08262e9d531c80fe0070d732ffe16b037524bf7cdbeafd9
font_01_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 11408 bytes
SHA-256: 9786184b6f6c82dbbf5c5d25cdb75c334e53f63b635fd2341319d34cb35ba782

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