Malicious PDF — malware analysis report

Static analysis result for SHA-256 a542ec7dc6058b9b…

MALICIOUS

PDF

71.7 KB Created: 2021-01-13 14:54:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5ab9f00322fff0e376dfb05c70fe1d8c SHA-1: f914a5c56c3221ce69c3090d0fc9d102c48665ac SHA-256: a542ec7dc6058b9b0915e6e8c69744e5cfe7ec23fa28878c9aeb8f00f424a986
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'escape room mystery word answers', directing users to a suspicious domain 'traffset.ru'. This indicates an attempt to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=escape+room+mystery+word+answers+level+33 PDF link annotation
    • https://sunerewej.weebly.com/uploads/1/3/4/7/134724547/4017151.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/eb8e32f138.pdfIn PDF document text
    • https://site-1171899.mozfiles.com/files/1171899/gepamalutelumewimos.pdfIn PDF document text
    • https://site-1173209.mozfiles.com/files/1173209/neritud.pdfIn PDF document text
    • https://site-1172440.mozfiles.com/files/1172440/joxekemisuwiremebusejivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473031/normal_5fc0b3b7b5cb7.pdfIn PDF document text
    • https://mibakadediwo.weebly.com/uploads/1/3/4/5/134584598/gorupano_kenebem.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/vejinuber-safesaf.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/bitajemisajoz/malayalam_christmas_carol_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/43849715713.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/angadi_theru_video_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/bowafo.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/vpn_app_free_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/52930584992.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_off0000d127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD127 5596 bytes
SHA-256: 7b73e5efce2d435c9ab1a0e82fbc9cfcc8de00ba4f400c3304effc0fb7d1d7d5
font_01_sfnt_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 10288 bytes
SHA-256: 98dd3e1a10343a76cea3f526d040a131667b544568287956d3a7ad30f322fee2

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