Malicious PDF — malware analysis report

Static analysis result for SHA-256 f890b500bc8035f4…

MALICIOUS

PDF

67.4 KB Created: 2020-12-23 13:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 13c93f6f3c6d2008da85b30cb0d17272 SHA-1: e2c920936c3df96a88f81254f67f70595835d1c9 SHA-256: f890b500bc8035f41c10e63681b5be900c25f607e6eca3419b627f05f0d1ce88
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDFs hosted on strikinglycdn.com, suggesting a link farm for SEO manipulation or phishing. One prominent URL, 'https://trafffi.ru/strik?utm_term=helicopter+gunship+strike+apk+download', indicates a lure for downloading software. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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://trafffi.ru/strik?utm_term=helicopter+gunship+strike+apk+download PDF link annotation
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/bivukuzogovisu_gakilefevom_pobijixo.pdfIn PDF document text
    • https://xalorato.weebly.com/uploads/1/3/4/3/134317389/xivupix-mawonanofikewi-nugiguxorikil.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/3074fde7839b.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/c9cc0755-674d-4888-8058-38222dfc68dd/pulse_3d_wireless_headset_ps5_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8415f2d5-dc9a-4859-ae1c-16167b86e731/kibulopotaminumaxenatowub.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/37575865311.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/bhojpuri_old_album_hd_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4295309-5622-4f71-8fef-26a3c94cb3d1/kelly_clarkson_wrapped_in_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90706720-56bd-411d-b230-1084d01d5f6b/84002346643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369aa338-e8d6-4a90-b075-bf95eae8c99d/31034928242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9359e1c5-8165-4d51-af37-4c3f71da9917/bobovamirosanum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1194b6bb-01c8-4fe3-975d-d654f284a4e9/bubble_witch_saga_apkmonk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8089ff34-b56a-41bc-9ae2-7730b7a86534/49706908571.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F3 5452 bytes
SHA-256: d9f8b5f50bf0b78b5883e78f74a59a32986bc9f547e7b0041805c6a426cdb25a
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 10732 bytes
SHA-256: a1f34661ce436948fbfa84b0e438d488e37ca66db161dae3ae10a7c58cb6fa0e

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