Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee73fe6d78c05b75…

MALICIOUS

PDF

121.0 KB Created: 2021-03-18 11:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2220604b373abe69e2dfb6c7cc63e801 SHA-1: 109864220e446d563458e7fb65e670c719d76d66 SHA-256: ee73fe6d78c05b755370750c7fc05fc9cdfc15f6b24ad6a3de69f2c88b11f3e3
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 0.9989

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://gimoguvi.ru/123?utm_term=cognos+analytics+report+studio+tutorial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470389/normal_601cdb79355fe.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/fvibDCH/41474322533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_602d7bae93c29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367617/normal_600277795df58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_602d470f97de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_600d457af0d20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453885/normal_5ffdf5db14275.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/9ifahje/kajubusanafowa.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/ex1Wjc6/28520047560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_600d8fcc25192.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/jjuhd9H/kopasu.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/giSg1tO/kungfu_heroes_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375357/normal_5ffeb0f5aa7b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_60466fd532df2.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://b147a2f3-58af-4013-9def-597e86e94513.filesusr.com/ugd/47d6bb_0cb51fdc078e449e81fc1979608e1c97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/badc02d9-bdea-446b-adf7-d423da8b9f77/15400000079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80efd02b-dfc3-4607-b24a-e48c11aae72e/69038906905.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_26441f8e41fa47d78c9f77777421929d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db697a3-99c0-44ef-ae3e-acad93b37344/iceberg_salad_calories_1_cup.pdfIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_6dd5779298de4d16aeac5234a2ff373a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afeda27-8aec-4ec7-8f87-69729857a831/tevubokazopumemalebife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e43c3a9-551b-479e-ad02-35cdc75d64a1/how_to_become_a_great_fingerstyle_guitarist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae23a8f-1a4f-4baa-8f19-d3723875b7d1/5_verbos_regulares_en_ingles_conjugados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f3b784-de1b-45a0-8c4a-04549fa92f77/digital_marketing_executive_jobs_for_freshers_in_bangalore.pdfIn PDF document text
    • https://0524119b-9543-44d4-a9c1-6a2a85ae2681.filesusr.com/ugd/b12506_45465b34e8e54a70b12b383de6aea0e7.pdf?index=trueIn 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_off00018c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C02 5248 bytes
SHA-256: 2c99c8605dc4bcec8632acf9282d8ea0ce95b7d374a963369f75083803ffc37e
font_01_sfnt_off00019df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DF0 12108 bytes
SHA-256: 49e6207446bd1c5c16889bb0cf74734dae1b47b12d6dd6dac5d51fba9eb4fb75
font_02_sfnt_off0001c74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C74F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c