Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd5318c9fd89f10…

MALICIOUS

PDF

84.5 KB Created: 2021-04-20 19:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ba3c57c16342bc2815e613eb9502a3af SHA-1: d177375892d627d041ef75a345499115d77d2525 SHA-256: afd5318c9fd89f10148bc7c167374a62e6dd19e9ec060329decad6fbd5e01d7c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one identified as malicious. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'yafferge.ru' as malicious. The ML classifier also strongly indicates maliciousness. The document body is heavily obfuscated and appears to be mostly garbage data, suggesting it's designed to obscure the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=ejercicios+de+verbos+irregulares+en+ingles+en+pasado+simple In PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_603bd8d98ec86.pdfIn PDF document text
    • https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/nalawuviwenal-fogegubabepo-movase-juzilitonim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470537/normal_5fce0ea5b19e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_60400aaab7c65.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/towolos.pdfIn PDF document text
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/fokibumibi_jiwade_rupuzomonozed.pdfIn PDF document text
    • https://geworusidexaj.weebly.com/uploads/1/3/5/3/135306562/07a6146c.pdfIn PDF document text
    • https://gunefadube.weebly.com/uploads/1/3/5/3/135388078/01636a62a79746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_eda58f3cbf4344ddb5d15f602bc84792.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_6b4ac4e0c9a8475bb730e5588dbe43ff.pdf?index=trueIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_704e3ab4c69949729ab599286a445c5e.pdf?index=trueIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_d167818916c146f8b1486fc621b1f3fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/sukaw.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/possessives_worksheets_grade_1.pdfIn PDF document text
    • http://seguwogira.rf.gd/antiemetic_pharmacology.pdfIn PDF document text
    • http://xawavejemefo.epizy.com/11932282563.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/zudov.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/losomifip.pdfIn PDF document text
    • http://finunaji.rf.gd/koreketab.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 6588 bytes
SHA-256: fa72874b8c381873b432d3b5cea9ecddba20f04e8e1c9face7d560df1136061a
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 5628 bytes
SHA-256: 1843e87a05e8f0341145be3d94d072596fc3923f59d4be7da79ad627c5e4410c
font_02_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 6220 bytes
SHA-256: 637607f50e21bbc25e773906325825b6c6e4aa241cd47df8ed40faa1476702c6
font_03_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 11992 bytes
SHA-256: a7800619098c16ebe1837a26371b0d3daf8425a6c32d770f5f32c091ba1fb913

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