Malicious PDF — malware analysis report

Static analysis result for SHA-256 417db7ad2c1b5548…

MALICIOUS

PDF

71.9 KB Created: 2021-01-18 19:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c7b9376383883ce626de6f86ae6e7ee SHA-1: 7756f8497f49bf605a5217925cad00805ea13d30 SHA-256: 417db7ad2c1b5548a4c597dfb580877dffd207886ed845ba99267c85dfc5f4a8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were extracted, the presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/aws?utm_term=email+formal+en+ingles+saludo
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/noriwodode_kotavutarofixa.pdf
    • https://bafokaxaxex.weebly.com/uploads/1/3/4/8/134881351/mixinu.pdf
    • https://cdn.sqhk.co/bomemenun/iejbJib/tuxuxiwopiwetowepinetik.pdf
    • https://varusotefus.weebly.com/uploads/1/3/1/3/131398431/jowujivilumexelixe.pdf
    • https://site-1167941.mozfiles.com/files/1167941/covid_positive_test_result_email.pdf
    • https://site-1168038.mozfiles.com/files/1168038/40105345000.pdf
    • https://cdn.sqhk.co/borefigux/cjcrg8h/business_leaders_board_members.pdf
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/347b5c54d100a5.pdf
    • https://site-1245429.mozfiles.com/files/1245429/8092661390.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://susupufewowe.epizy.com/zotakiwipu.pdf
    • http://savefativiluz.epizy.com/international_financial_reporting_standards_council.pdf
    • https://s3.amazonaws.com/musoxifuvitalo/97367632456.pdf
    • http://wuparol.epizy.com/burma_movie_songs_isaimini.pdf
    • https://s3.amazonaws.com/mogipegi/95950886201.pdf
    • http://fujesotes.epizy.com/zupapevolane.pdf
    • https://s3.amazonaws.com/lixasifasi/16110370102.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_off0000dd86.bin
e53b20c9a0130de196c4c568c33c205b974111c86d1dfc8831fe9ec1e9b82710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 5184 bytes
font_01_sfnt_off0000ef13.bin
367ff3d2c45ff59bde87e2c3c6ead74f66f813a2afeaa9a930b9367939de7fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 10460 bytes

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