Malicious PDF — malware analysis report

Static analysis result for SHA-256 a850caf3bff02cf5…

MALICIOUS

PDF

79.9 KB Created: 2021-04-08 08:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b96b9247035795d4f18aeb3759c6ed53 SHA-1: c78df9d05b23026b2031c2eba7af0b4a45d918fc SHA-256: a850caf3bff02cf5c2d41388416f6377a679fb003778dee8c7dc50e64bb84126
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://ponafet.ru/wix?keyword=ghost+gate+opener+installation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464720/normal_603618b7a48a4.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/Xibifia/snake_touched_by_a_curse.pdfIn PDF document text
    • https://nekawosewifij.weebly.com/uploads/1/3/2/8/132815774/bujiposoruwurax.pdfIn PDF document text
    • https://kibopomirisusi.weebly.com/uploads/1/3/2/7/132741064/3906570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_601120321f03f.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/Ehjcehj/android_games_zombie_tsunami_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6059c97656318.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/hg7NGhv/first_recharge_mobile_legends.pdfIn PDF document text
    • http://xuxogez.22web.org/is_the_sao_light_novel_over.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496165/normal_5ffe4f708c303.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/idP37fk/demusotefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_606e14876564c.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/jhcL4gg/sixth_grade_worksheets_reading.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/jet4hdg/65814644991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_31065b73b70c45838f1f3f9fd58571c0.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_8d3bce9d0ed54a00854bc58e7ea22085.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_623dd5313c3e461690238ed5eda74ba5.pdf?index=trueIn PDF document text
    • http://bilodevufutumu.rf.gd/neurofibromatosis_tipos.pdfIn PDF document text
    • http://sedegavokoxuk.epizy.com/jewish_bible_in_english.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_5cb44351e7454cb59cb5d44b7522f921.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_d72aa93641234bb89e472bd560ac8061.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 5112 bytes
SHA-256: 7a24b7454b768a624c5ddafdb66af61303035203e7c6c26f6d99414a7b35ca99
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 10968 bytes
SHA-256: 12e06a7aa3ba74c8c944b5808db6ad1d24ed6eb6560e7a1c9c6ec5cb95b627c7

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