Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf4d0358120e470…

MALICIOUS

PDF

75.9 KB Created: 2021-02-22 01:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 83e33d7a0da2d5f701ed85b80f17dc6c SHA-1: 5dad27f5658870313e46d5a8dace911909a22cbe SHA-256: aaf4d0358120e470489da29a240278a06210bf0d2834237e98e10898199d3cdb
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an intent to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a focus on link manipulation for potentially harmful purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=st.+mary%2527s+cemetery PDF link annotation
    • https://cdn.sqhk.co/girasufu/hhVtCje/ben_10_omnitrix_glitch_apk.pdfIn PDF document text
    • http://youtube-subscribes.com/african_female_warrior_names5fpmg.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/dZc3WE2/90969029963.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/3032596.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/211031.pdfIn PDF document text
    • https://cdn.sqhk.co/nevawanipo/5JggKjh/pixel_dungeon_heroic_leap.pdfIn PDF document text
    • http://pixell.store/402998625283uaaa.pdfIn PDF document text
    • http://kmplitka.shop/honeywell_thermostat_manual_dt90eenwkp.pdfIn PDF document text
    • http://lnstagramverifycentre.com/974359074950kqe6.pdfIn PDF document text
    • http://sosed.market/xodijoyhmwq.pdfIn PDF document text
    • http://weinmvc.net/effects_of_bullying_in_the_philippines76thj.pdfIn PDF document text
    • https://cdn.sqhk.co/pikevasoze/ejiQ9K7/keniwefepi.pdfIn PDF document text
    • https://dofufegudi.weebly.com/uploads/1/3/1/3/131381881/toganevos.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/bulozor/fizijazezunarekowixokep.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/mijowutum.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/poseidon_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/2903337951.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/71868896458.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_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 4708 bytes
SHA-256: abfa2a1c321b3e609431018e56050b58c6192540cc1bc7d90995aaccd278217c
font_01_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 10864 bytes
SHA-256: e4000b5d4d126ae021a6d8a44d59766fd86b5a527068c61e39f7fa3698d70fc3
font_02_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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