Malicious PDF — malware analysis report

Static analysis result for SHA-256 880b3d14e9485e34…

MALICIOUS

PDF

78.0 KB Created: 2021-05-15 04:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9cdf82e07137953b5e81a3ee1a011b96 SHA-1: 70a3d185da3579368e7f344e454f3a4115e0ac45 SHA-256: 880b3d14e9485e349df1f3900cfcaef336fce6038142fa490a99f60770d6979d
156 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 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=grim+dawn+forgotten+gods+best+starter+builds+2020 PDF link annotation
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/2c5904d7.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/6ig0IyI/27967483048.pdfIn PDF document text
    • https://zenanewexakidop.weebly.com/uploads/1/3/5/3/135310893/fc57a4a9.pdfIn PDF document text
    • https://vebexedupatad.weebly.com/uploads/1/3/2/7/132740253/gotifefujadi.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/Kjcykjb/business_strategy_game_quiz_1_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/bX24iaz/62864399770.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5d2e37-09ac-40eb-9f09-6a67a22664c5/microsoft_end_of_life_operating_systems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2616dbb-f3c9-4280-9108-128828112406/text_box_icon_png.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/rilepikaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a56ea3e-f440-4182-b8d7-17f9ae17f4d0/introduction_to_thermal_physics_schroeder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4565cebd-2330-455f-812e-6bdd2fe09aff/koximataves.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/96252857609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cc8d8e-d6ac-4409-a254-1e8a7cfb19f6/the_dialectical_behavior_therapy_skills_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/a_streetcar_named_desire_scene_1_quotes_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7d5974-3638-4d6a-92b1-559b1a545bc7/tufamopolikimak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae50e3e9-1be0-4ab9-b1f1-c25fda6a1575/63513563360.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/goderuri.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/how_to_divine_mercy_chaplet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f995f88-56b4-4818-9e80-3012554f27cd/cuanto_es_1_70_metros_en_pulgadas.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_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 5764 bytes
SHA-256: 2a368e728366b2334e6aa20fee7b64cedc5664d5800e0896f46b82c89e969f09
font_01_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 10648 bytes
SHA-256: 26a4d7508c7d9f56909864c5071464f64fe64e0e8a2885868685c58647c0d184

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