Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd01391c1cd0ece4…

MALICIOUS

PDF

117.8 KB Created: 2021-06-09 06:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4eafd4b7ee2f50311e6ef787aae71037 SHA-1: 665894f69c689ab10b582b8d21fabf86cdcc7819 SHA-256: fd01391c1cd0ece4bd0899d1cbd7369e3ddd00e5ea69474d27b2860eb6935881
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a large number of external URLs pointing to other PDF files, likely for SEO manipulation or to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary technique likely being Spearphishing Attachment (T1566.001) if delivered via email. No scripts were extracted, but the extensive link farm suggests a redirection or download mechanism.

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
  • 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://ketchas.ru/pbw?utm_term=led+lcd+panel+repair+book+pdf PDF link annotation
    • https://jivexirod.weebly.com/uploads/1/3/4/7/134707467/2310703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_600e4108457c1.pdfIn PDF document text
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/malofegugifasewegoge.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/fewavix.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/xuxakex_naligevukaso.pdfIn PDF document text
    • https://xifamileg.weebly.com/uploads/1/3/4/6/134687686/sutobe_kirofonozogi.pdfIn PDF document text
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/newomenexelugo_dimazafexova_rifewizin.pdfIn PDF document text
    • https://fogoranamixite.weebly.com/uploads/1/3/5/3/135390362/ec2c67.pdfIn PDF document text
    • https://nadezawopituwij.weebly.com/uploads/1/3/4/6/134643068/26f06085c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fe0c0609d64b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494681/normal_5fe3c1a3c5fdc.pdfIn PDF document text
    • https://fikelepokaretes.weebly.com/uploads/1/3/1/3/131397971/9426349.pdfIn PDF document text
    • https://palekanino.weebly.com/uploads/1/3/4/3/134372766/zebibaximugumumevoza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5ffc3bfc6f8e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_60489d3b8abdb.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/586365d2-160a-4f12-9a16-91ba24572e7f/53390254379.pdfIn PDF document text
    • http://ganosidil.pbworks.com/w/file/fetch/144456510/how_to_root_galaxy_tab_10.1_gt-p7510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc190242-8e57-4256-9e96-6d932bf37516/61371631930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/270be056-fca7-442b-bb97-783cdfc22d5d/keliradedox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e23254-6a8b-484f-b493-000e60cd1779/fluke_435_series_ii_price.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144815976/fallout_3_bobblehead_locations_list.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_off0001872d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1872D 5116 bytes
SHA-256: d861d9c158f099dc0fd856580668fd52f1740d1eaae9fc0515a86533b9dc8884
font_01_sfnt_off000198a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198A5 17080 bytes
SHA-256: 1c93775fb32645fc55caf6eae12a43614582cd293d7785f9d37b9e83d7a646e0