Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a628461f28e5659…

MALICIOUS

PDF

88.5 KB Created: 2020-12-29 14:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 749d92b334dd4b8284413a53cf599768 SHA-1: 93319d69d31c8285f13f73d4134b6fe954950048 SHA-256: 9a628461f28e5659bc9ab747d8772933fb03a01d544fe2813d532b010129035c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or phishing campaigns to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for credential harvesting or further malware delivery.

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://traffset.ru/strik?utm_term=football+scores+results+today PDF link annotation
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/0ba5f12cdba6f85.pdfIn PDF document text
    • https://jujarodi.weebly.com/uploads/1/3/4/5/134507231/52143dc48f18ab.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/ce13996a-36ce-4305-945f-27535c3855bb/slot_car_drag_racing_burnout.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/38433680660.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/guideline_percentage_android.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/preeclampsia_pathophysiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9001ee-a4b4-461e-bea3-f0d48b695e32/62344564017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ed8bb0-3ebf-4958-8755-97bb8b44a695/30883619030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d7087a-d4ef-4af5-9d80-98ec191bf9ab/13294844785.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/air_pollution_project_for_college_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/gb_shaw_arms_and_the_man.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/reniform_leaf_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115798e1-d33d-483d-948e-ca6ca5675f15/tokegemodijimi.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_off00011bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 5132 bytes
SHA-256: 3217da5d2c9596ab65afb7ed68e95833c2a19e90a49eadd9a24e20e49ce6fb19
font_01_sfnt_off00012d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D78 11568 bytes
SHA-256: f145028a7488beb678d30e67ba3bc991bc72ed48e0b9835ffbb13452bc0d7984

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