Malicious PDF — malware analysis report

Static analysis result for SHA-256 56851af353932c02…

MALICIOUS

PDF

75.7 KB Created: 2021-01-11 05:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 23bb6f696ad914aff06069b398f7ad79 SHA-1: cb2b33e683330ba95679f246b48f2eb43cebf049 SHA-256: 56851af353932c02dfb602cdf8084b1733bf57ff164d202d11c2650c42b26a4e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

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
  • 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://trafffe.ru/123?utm_term=4+3+defense+vs+3+4 PDF link annotation
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/setuparewapaf_jiruvogu.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/tugifigerez-xunikapul-kawepi-keganilaxaxer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fd28a064c2c2.pdfIn PDF document text
    • https://site-1177946.mozfiles.com/files/1177946/besajirosesil.pdfIn PDF document text
    • https://bevubulik.weebly.com/uploads/1/3/2/6/132680874/zewunizojuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_5fd878a659bd3.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/cd649fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_5f9b14601ab76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_5f9b04aea1510.pdfIn PDF document text
    • https://site-1174627.mozfiles.com/files/1174627/bouncing_ball_after_effects_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5fbb85ecd06ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/google_docs_ocr.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/napedotiteraxesos.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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 4332 bytes
SHA-256: ba7b518a989f0ca118cdcd1ac3b025b4536812313ae724ac32166e0fac0dbf68
font_01_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 11024 bytes
SHA-256: ca62d537ca2f03a07408ea2da256a13d4e931f2cb305e57b989061dcfc942aa7
font_02_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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