Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0b46d77e0bb568…

MALICIOUS

PDF

72.6 KB Created: 2021-01-15 06:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1363d42f07082bbe3fe69cf8d4dc53b2 SHA-1: e95e716590bac3bdbe02974e83f6badda4fcd4ca SHA-256: 9d0b46d77e0bb568d9cbe4fef75b199ec3c480354404294115aa7e8c08a967e9
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains, likely for SEO manipulation or to distribute further malware. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=apache++php+files PDF link annotation
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/sikaz.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/vilofi.pdfIn PDF document text
    • https://ximixejolulozo.weebly.com/uploads/1/3/4/3/134351986/lodijejiropogu.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/c25f730.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/rotegumiti.pdfIn PDF document text
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/326ee.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/f180dc.pdfIn PDF document text
    • https://pemopuxurumolu.weebly.com/uploads/1/3/2/6/132681293/d976275a4ce.pdfIn PDF document text
    • https://fagedudadisex.weebly.com/uploads/1/3/0/8/130874641/4778054.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/jhjjjcz/jamaba.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/1925348.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/2b341.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/lifHie3/the_adventures_of_tom_sawyer_play_characters.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/risisipajole/41133309446.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/freddie_mac_home_possible_gift_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/33623413696.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_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 4996 bytes
SHA-256: 062669d1a7e7acd65775d37bf53410beddf1066dc858f14b2593925ebfa6ad6b
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 9960 bytes
SHA-256: f46e47c3c7eb0f2aaf3be47adc07e15207a41a000cfb467473778c4caf64e551

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