Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c01deb8b815a3ba…

MALICIOUS

PDF

93.4 KB Created: 2021-03-29 00:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d2a6e07b16971d300d41d75edb084fc1 SHA-1: 3666556d296a508476154991c5a74485b1702e94 SHA-256: 0c01deb8b815a3ba9c8f48039f01f833a4a7d8b50745a2dab57e8e3fd8b5a00c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=ap+grama+sachivalayam+panchayat+secretary+syllabus+telugu+pdf PDF link annotation
    • http://lezeninimi.medianewsonline.com/18894861867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_6023e6fc54384.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/belgrade_city_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_606022e571d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_600fb072c9929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489264/normal_60382f16c0456.pdfIn PDF document text
    • https://winateminapalem.weebly.com/uploads/1/3/4/0/134041456/0ce00d4.pdfIn PDF document text
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/173979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_6039b6367a93b.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/siposigexefado.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/musokite.pdfIn PDF document text
    • http://nemagufi.mywebcommunity.org/stephenie_meyer_earnings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_6053771591090.pdfIn PDF document text
    • https://zipibolusoxa.weebly.com/uploads/1/3/4/6/134627603/luxama_xurokakewu_tepinapaxeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5fe8ec5442c10.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/what_do_triangles_mean_on_floor_plans.pdfIn PDF document text
    • https://dagepafu.weebly.com/uploads/1/3/2/7/132740813/ludevanutosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_60488f5c17f2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366331/normal_5fee1642629f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://liroporuki.myartsonline.com/fodixonavijibim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e3b72b-ba08-4e53-bbb0-fab8de2db37d/what_is_the_ticker_symbol_for_brent_crude_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d7d785-d1bf-4c87-b502-1f13be544788/samsung_xpress_m2880fw_setup.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_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 5860 bytes
SHA-256: b89d07ba2be51c6b4b956bb5bdb8fa2f213d4a2ce1c5b073ae218d2d73f53697
font_01_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 24556 bytes
SHA-256: 28600ce07066294181cb6fe90feae688a938ee3de68a70cd9e19fa14e398ee71
font_02_sfnt_off00014369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14369 10488 bytes
SHA-256: ca770efcd6f68dfdb1960bbef7e8adfd099b4288add3cdda41019f4c6a06d21f