Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d085e2f0e9c3e3…

MALICIOUS

PDF

79.1 KB Created: 2020-11-27 10:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a7930f26223811d3d0672ef8f2388f61 SHA-1: 7dbdd972663aa8b4278069acd146e4118db918f5 SHA-256: a4d085e2f0e9c3e3068cb1fbd5d776f30f551150dffcbcf5870ed2336902ceb2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score. The presence of a PDF link farm heuristic suggests an attempt to generate traffic or distribute content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a potential phishing or malicious content distribution attempt, possibly leveraging embedded JavaScript for execution.

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://trafficel.ru/strik?utm_term=lg+dryer+not+drying+fully PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463808/normal_5fbdbffd76872.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/vaxibazose-fuvenugetom-kudujute-nofotedumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_5f9fb8d8b85fd.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/lebiruzu-tefam-vudatakit-nofixokuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/bass_guitar_fretboard_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/examen_ceneval_acuerdo_286.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/2012_end_of_world_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b935267d-63ae-418b-a1be-84c2bcb22f13/le_creuset_teapot_blue.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/97589879104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c26bba-2d39-44a0-a01b-a8e73f3de9e1/bulosovajibunibamajij.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/25454299068.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/tetopenaboxiwulu.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/gta_vice_city_free_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/next_chest_clash_royale.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_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 4732 bytes
SHA-256: 9cb6cb7e95e0593f89a41f8cbe7c1e2b150339cd953b2b8f4a42624db29bfc1f
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 11228 bytes
SHA-256: 09be183d76b8532655bcc5e87e08b9e37545c52335597f835f2fb2d60880bf14

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