Malicious PDF — malware analysis report

Static analysis result for SHA-256 826e6cd33ebc20b9…

MALICIOUS

PDF

70.7 KB Created: 2021-04-05 13:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c23b2915b111cad7f9ba33626c72d6f9 SHA-1: 2f225b71008e1f5a980e170c41f07380b1d60e9c SHA-256: 826e6cd33ebc20b95ce7cff0ea2478cff676f1a2b407fac1f29e5b3ad3df8d2d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, contains references to product names, suggesting a lure to disguise the malicious intent.

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/123?utm_term=adidas+hypersleek+platform+sneakers In PDF document text
    • http://gnatural.space/cahier_de_recette_fonctionnelleiqjcn.pdfIn PDF document text
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/9225900.pdfIn PDF document text
    • http://mapugukabazewu.scienceontheweb.net/fuvenobi.pdfIn PDF document text
    • https://lazofakivew.weebly.com/uploads/1/3/1/4/131406449/2800997.pdfIn PDF document text
    • http://sexewemomupepu.22web.org/45859582950.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/jeliledef.pdfIn PDF document text
    • http://legalvictory.group/how_to_scan_canon_mp2508p614.pdfIn PDF document text
    • http://damodudajipofem.22web.org/calculus_2_jkuat.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/descargar_biblia_paralela.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/11317.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopagozijudiri.epizy.com/risk_management_policy_template_solicitors.pdfIn PDF document text
    • http://gubodasitonobu.epizy.com/8388985361.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_b8a9a72e1e4e47299921654d3bf60314.pdf?index=trueIn PDF document text
    • http://tadukaxuzevida.epizy.com/rupagivoluriwanesoxez.pdfIn PDF document text
    • http://bojilukirifep.rf.gd/word_association_test_with_answers.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_498096912fce473faad1975d87a974eb.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_cab8848e86744157a70c7f602298dc1d.pdf?index=trueIn PDF document text
    • http://sabukizazuse.epizy.com/binary_decimal_number_system.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 5436 bytes
SHA-256: 7f314f716971637b9296ffc21a1e70404121c4d5a0f32c9e0bd2ef7a0c75e871
font_01_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 10800 bytes
SHA-256: 00d90a10a026c09fd731077e5c9b5e0ca0e0353059d883531f611ff9dd41bd76

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