Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1f40266f76623b…

MALICIOUS

PDF

80.8 KB Created: 2021-03-06 08:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 81269d80e0a927aab710d3a66819ded0 SHA-1: 38eb50c41dc3997b87047431ee3b4a168c7a1104 SHA-256: 6b1f40266f76623b805acd30f17d8bd617f249ae95614e62b13f793ea147897d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jumiwimov.ru/123?utm_term=craftsman+air+compressor+regulator+switch PDF link annotation
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/1636568.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/giriko.pdfIn PDF document text
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/mudezorotuledo_subuse.pdfIn PDF document text
    • https://diritirafimiwav.weebly.com/uploads/1/3/4/3/134376035/2809d07baa9d4c.pdfIn PDF document text
    • https://vafarisitoguv.weebly.com/uploads/1/3/0/8/130874489/2b02b00635.pdfIn PDF document text
    • https://sileperu.weebly.com/uploads/1/3/1/4/131406390/7224715.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/nojifaz_sirixo.pdfIn PDF document text
    • http://mivetys.xyz/holman_kjv_study_bible_onlinem5t2y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6024811c4d955.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/4448790.pdfIn PDF document text
    • http://umniashka.ru/fusionner_avec_adobe_acrobat_readerk7g2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492901/normal_601a0fa179643.pdfIn PDF document text
    • https://wijejotuxaketuv.weebly.com/uploads/1/3/4/3/134338978/7acbaeff4ed1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491151/normal_5fcee2eb39334.pdfIn PDF document text
    • http://begetus11ppz.xyz/76544107494h9fwt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_6041bb18cde27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_6004a4300edcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_9fc39594acec4f9faa598c8ba417a491.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c392cc6-cab0-4f20-a8cb-78accf3a721a/95347814308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b264c190-e393-48c7-83ae-7403bf02c1ee/can_i_use_oat_milk_to_make_rice_pudding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f451bb-e431-4209-8fc9-22f51fc6eec7/john_deere_265_parts_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41eccfaf-fa26-4f16-ab21-b3fcc6fed7bf/how_does_the_firm_book_end.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_c9c00ea175ff49168e560288b1ef71e0.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_d334541e829749619a67a63faca41e0e.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_9329a882c8f845d986bda59772c4888c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea119d2-229e-4be3-9d09-ddd219bdcafc/sudedunemorotupojeteg.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_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 5428 bytes
SHA-256: 30fd0b3aa2831235101500b2ce94e70649d974e6fdc191d11fe522aec7129282
font_01_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 11232 bytes
SHA-256: de0acd33e61c8974c2e28ffc58e39b0424a1f6070613c7596aa9c615e5132bb1