Malicious PDF — malware analysis report

Static analysis result for SHA-256 9851cbb8b9e32d92…

MALICIOUS

PDF

75.1 KB Created: 2021-01-05 17:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ae3d8ed2de643ee7d09b650b38148229 SHA-1: e37b83cf9892f3759c1857a6641481aa147575d6 SHA-256: 9851cbb8b9e32d928525c749ea1b115f44e7a0d16d9eafa05c7b47049c342b9b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a PDF phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafficel.ru/123?utm_term=dodge+omni+glh+1%252F4+mile PDF link annotation
    • https://samojosaletope.weebly.com/uploads/1/3/4/0/134017273/fajufagonofurozazefi.pdfIn PDF document text
    • https://bebopajuze.weebly.com/uploads/1/3/5/3/135312866/1331832.pdfIn PDF document text
    • https://bomosaxume.weebly.com/uploads/1/3/4/8/134892214/wujated.pdfIn PDF document text
    • https://fiwaxajosikevi.weebly.com/uploads/1/3/4/8/134885015/jonusaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_5f9a73fc11777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455207/normal_5fd9c1d2227c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5fc695ccd513c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f876e7768aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_5fa8ba4fdad5b.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/bovufimagabako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_5fc0dc7f162ec.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/tubukeganuji/mariam_khan_reporting_live_serial_sad_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/dudifibe.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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 4932 bytes
SHA-256: f0d36145726332c2cd621347c280ba0679c8daff710f5f7393f18441f57f8007
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 11260 bytes
SHA-256: e87c61a68f1788f421d80ad1707307c67710a9a1fbeda214d4a410cac64aada1

Open this report in the interactive analyzer, or submit your own file for analysis.