Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d4a4626813af34…

MALICIOUS

PDF

89.4 KB Created: 2021-02-25 23:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 61fadf19a3cc5314eabd700bea03598b SHA-1: 2786eeb5719819f4f6a863c1437c275e9891d60f SHA-256: f5d4a4626813af34ce432f1e7877a2e64a2bbcbc3400b3a05f14107d1ae8a72c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The embedded document body, though heavily obfuscated, contains text related to geometric figures, likely a lure. The presence of multiple unknown URLs and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely related to phishing or ad fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=objetivo+de+las+figuras+geometricas+en+primaria PDF link annotation
    • https://cdn.sqhk.co/definuseju/ubAje6V/suraberevudejegod.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/5865523659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383913/normal_5febc6b85c1cc.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/459991.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/2jhgd7M/67526565183.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/what_are_jobs_daughters_names.pdfIn PDF document text
    • https://gipodebitu.weebly.com/uploads/1/3/6/0/136000977/8397930.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://s3.amazonaws.com/bededuxotulapil/beautiful_love_birds_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/critical_thinking_basic_questions_and_answers.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/taco_bell_nutrition_soft_taco_supreme.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/world_of_darkness_slasher.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/anime_girl_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/22117102182.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_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 5660 bytes
SHA-256: 1df8bd377d90fa3ba3f11ba184168447b7f82a90772cd677f1021dacf03446a8
font_01_sfnt_off00012198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 12004 bytes
SHA-256: 29c05b7555487ef2ee51840f94c9af9175b4227734f58519f2f099efde32bc87
font_02_sfnt_off0001483d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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