Malicious PDF — malware analysis report

Static analysis result for SHA-256 c929835bdba77510…

MALICIOUS

PDF

73.8 KB Created: 2021-04-03 16:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb3e9618b12820f78a4bba7ebf291a2b SHA-1: 71d48c7535ae3691bda39d69041622c05a0c3164 SHA-256: c929835bdba7751096b141a081b319cdb97453722ce367e2b42622462bfa3c63
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=al+ahram+pdf+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4424696/normal_6007c3406e4e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389384/normal_5ffddf4cd1877.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/Emibrig/83867326087.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/hadMyhb/my_singing_monsters_dawn_of_fire_prismatic_shrubb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_602e6d15dce10.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/rgeidjf/my_talking_tom_friends_download_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488582/normal_5fdd8327a87ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_602e5b8d4e022.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/djYRIAm/72784493578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407086/normal_60469cd23883a.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/0hbHBgg/pozurelodazuneposipe.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://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_634b3c8734214462bf3a40ebe6f4cab6.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_eccd152399b841b49112eb5378b3adfc.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_1c4b93c5461f4866a7e7e6ef4d2d9ea3.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_edb387561c9e4cac9d92a0cbfba8f964.pdf?index=trueIn PDF document text
    • http://deketinak.rf.gd/narapunoxoleguxotefuzurar.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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 4728 bytes
SHA-256: 6caa0bbe4c3a53480b2111689c168fad21e660afcfd0a96c494c2d4eec8f792d
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 9656 bytes
SHA-256: 66726af44ffc8190f10a15ba7991f14c5b8c7a4ed9e0bc4e537d2b56d1f7a722
font_02_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e