Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a21a7c87c4a7627…

MALICIOUS

PDF

78.6 KB Created: 2021-01-04 17:38:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 33f16350af1a06ac4a63ca933b90751e SHA-1: 9dec243fdf95a69fb9fe1dab262fb6881d1d8cbe SHA-256: 5a21a7c87c4a76272b4fde7653910b2514699187c667aad90873df7f3d32108f
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDF files hosted on link farms and SEO redirectors. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a deliberate attempt to create a network of links for deceptive purposes, likely phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/aws?utm_term=breast+cancer+pathology+report+guide PDF link annotation
    • https://cdn.sqhk.co/xakelafu/ijiiixK/pujesajo.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/ihbifhh/maxis_match_cc_world_navigation.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/tbie6jb/online_python_compiler_3._7._2.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/9f9fe0.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/igbFhhd/neo_scavenger_map.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumula/ihbXrb6/scary_ringtones_sounds_download.pdfIn PDF document text
    • https://xixunogada.weebly.com/uploads/1/3/4/3/134343035/5088615.pdfIn PDF document text
    • https://cdn.sqhk.co/jadilogivusa/gifvgsj/63643335169.pdfIn PDF document text
    • https://pepowogipiwud.weebly.com/uploads/1/3/4/3/134344034/2005695.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/Y6wD4GW/frantics_game_ps4.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/33e165fce2.pdfIn PDF document text
    • https://xofiguguja.weebly.com/uploads/1/3/2/7/132710561/ba34c5b.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/pizivurapab/congenital_heart_disease_guidelines_2008.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/womabevadekaleserumemube.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/3726135300.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/fusanonafutizi.pdfIn PDF document text
    • https://medlineplus.gov/breastcancer.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 5488 bytes
SHA-256: 4c01775a38e3a1dafdc250aedf5d19ccb11bd0212a381bec85df8be5d865dba3
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 10612 bytes
SHA-256: b2022879ce9174afdc14b92e66653a117f7f19dc52b302c4263f52e57033cbe3

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