Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cee99d5d787dc48…

MALICIOUS

PDF

81.0 KB Created: 2021-06-09 18:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5c0251b1911388d3118f42694a5f8987 SHA-1: 6bb1cd8122a7e38a663fad93cd5239d59d05ed48 SHA-256: 0cee99d5d787dc4813155f22740ab29ce84829794cb07460b0583522c62b9a9c
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 0.9954

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://chcial.ru/pbw?utm_term=watch+3+idiots+full+movie+english+subtitles PDF link annotation
    • https://zejabiforisog.weebly.com/uploads/1/3/4/2/134266870/2681591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_605ef10e36623.pdfIn PDF document text
    • https://putidano.weebly.com/uploads/1/3/4/3/134388569/zaneverevafesezos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_5fd6fc0b9e66b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_6020b88672ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_60355b4c3e4a3.pdfIn PDF document text
    • https://denowulak.weebly.com/uploads/1/3/3/9/133997299/vasira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393752/normal_5fc5c44797f93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_6000d8f11d07f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5fee8865144cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_603179787dfc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410443/normal_5fe43082cd3c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497344/normal_5fcaa81c27531.pdfIn PDF document text
    • https://gupasozulo.weebly.com/uploads/1/3/4/4/134471060/5043268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_603b0cda349e5.pdfIn PDF document text
    • https://jebezowurexa.weebly.com/uploads/1/3/4/5/134576847/vajufumivumoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_600fb0d8af853.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/9921915.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/7f7610efb52f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_605f4b59abee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_601dd8c29b4b5.pdfIn 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/d54767f2-fe6b-47f4-95d9-13c98cd4417a/33479585466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9381678c-7e8c-4ed6-a3f9-77ae991fa50f/68850859330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702ecc03-21e2-4ecb-9cbc-d1385e9138ba/lonuwonofapuzogeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0fe7a8-03fe-488a-af2b-e9e19ab13716/pokemon_tower_defense_unblocked_games_76.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/970d8e43-f13a-46a1-b56c-894ec6661bdc/2180002256.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 5596 bytes
SHA-256: eac6b8ec90941f71bb2e0dc0940fcf29448dd816744a6eb7eb08f2edb93bc30b
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10796 bytes
SHA-256: 214e29041d00078521520a55d0e4b989451e82240464d6654fcf0e8fb80c5392
font_02_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378