Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c0d30bdcaa450f…

MALICIOUS

PDF

70.9 KB Created: 2021-01-10 18:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6304273a78d80eb011874ffaddbd8eed SHA-1: 9466af452ecd816db81472328f7f6fc564abc018 SHA-256: f9c0d30bdcaa450f24b9581a3eb50d5dd638314f8048d2114d648b5c0a0093f5
244 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 hosted on disposable domains, and at least one link points to known malicious redirector infrastructure. This indicates a phishing or malware distribution attempt, likely leveraging a spearphishing attachment as the initial access vector. No scripts were extracted, but the heuristic firings strongly suggest malicious intent through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=converting+between+decimals+percents+and+fractions+worksheet In PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/038df5f.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/tricky_beer_pong_challenges_list.pdfIn PDF document text
    • https://site-1167993.mozfiles.com/files/1167993/gorelub.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/3229741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5fc71eff08565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5feaed186ea01.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/podaxinazabiles_muposipuz_rajuzagobanirup.pdfIn PDF document text
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/pabago-bisigupewul-tezelemeru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5f9aeb47995cd.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/f8009f8ff2d6c0b.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/rodigapigeta/11961468943.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_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 5832 bytes
SHA-256: 572ff08e359701cc69a117d455a26cfaf23243f3e8e6400913db3b4debf38b36
font_01_sfnt_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 10948 bytes
SHA-256: bfe70ca46e1945acfd8999a1b86e9ef4b2923f4c50ae8c7f2635b0274133921e

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