Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2dfa4d478cc87fa…

MALICIOUS

PDF

71.2 KB Created: 2021-02-23 06:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e85e5b1e4f8c8105918ce3e4dfc3cd5 SHA-1: 5c259d6d6a8816a0eb5c30ff08d2c7cef67faa12 SHA-256: b2dfa4d478cc87fa7f0c15719501e481e421c60dd2b29de2edc593b0737e0fa3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, detected by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of these links, https://crophysi.ru/123?utm_term=ashton+drake+boy+dolls+uk, is flagged as suspicious. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it may attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=ashton+drake+boy+dolls+uk
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/4697492.pdf
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/4652985.pdf
    • https://suvukesirer.weebly.com/uploads/1/3/4/3/134316802/gemewukewurekawud.pdf
    • http://detolenikalopaj.iblogger.org/snake_iii_game_java.pdf
    • https://cdn.sqhk.co/baluwofuk/g3gsShc/sobunepi.pdf
    • https://cdn-cms.f-static.net/uploads/4408177/normal_602a723f0a3f6.pdf
    • https://cdn.sqhk.co/suzeboxiwo/cKCFxhi/93216881551.pdf
    • https://cdn.sqhk.co/temejikowewa/f0fibj4/1219865829.pdf
    • https://jetosopotow.weebly.com/uploads/1/3/4/0/134018613/967c8be94892689.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dotivaf/bootstrap_form_builder_multiple_columns.pdf
    • https://s3.amazonaws.com/patotale/fuzanenuxukirigu.pdf
    • https://s3.amazonaws.com/mupukesunobaga/vezuwunuwuziminiwevasegi.pdf
    • https://s3.amazonaws.com/nonabafat/emulator_psx_pc.pdf
    • http://welididoseburiv.epizy.com/human_relations_theory_definition.pdf
    • http://jigutur.epizy.com/zerudevulimutanobumi.pdf
    • https://s3.amazonaws.com/gixawetopoli/72659598150.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79b.bin
514a8c8ed6782eef4be252afda29a8d8fbeac493dd10d738f650a9256279959d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 5208 bytes
font_01_sfnt_off0000e94d.bin
571c063eaa13a07b05db6c95931230b245667f667ef4433c1e45bd661d1f1bfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 11400 bytes