Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9043bbb128e94…

MALICIOUS

PDF

73.6 KB Created: 2021-04-08 03:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 14a1f25fe50456c1733b72bac0f7d852 SHA-1: 65aa4cfcb7a2f28d43cd1325c3cc1534a04fab40 SHA-256: c9a9043bbb128e9471db4fadd04c030f89e0fec6ac69a13d3cfc44bc9150f3f4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs likely lead to further malicious content or phishing pages, aiming to deceive users into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://soxebez.ru/strik?utm_term=white+led+christmas+tree+lights+tesco PDF link annotation
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/9c86ff83f48.pdfIn PDF document text
    • https://lasirobazu.weebly.com/uploads/1/3/4/3/134399905/2036190.pdfIn PDF document text
    • https://burogoga.weebly.com/uploads/1/3/2/7/132740280/lolugetito.pdfIn PDF document text
    • http://raisinsapp.pro/statistical_learning_with_applications_in_r29zl3.pdfIn PDF document text
    • http://xbet1.fun/do_bosch_jigsaw_blades_fit_black_and_deckerr6uiw.pdfIn PDF document text
    • http://effektzhizni.ru/85251543471w25py.pdfIn PDF document text
    • http://physcoo.com/fezivopisikutaxujf6kvy.pdfIn PDF document text
    • https://tosojeravi.weebly.com/uploads/1/3/4/6/134617838/1807826.pdfIn PDF document text
    • http://nasporte1.fun/142525410224200w.pdfIn PDF document text
    • http://itverys.space/tamilrockers_hd_movie_2018_2._0r5get.pdfIn PDF document text
    • https://mogeletonedilo.weebly.com/uploads/1/3/1/4/131482944/fuferuwik_nasawore_momatopilajofu_zesoke.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/kanorujedatumo.pdfIn PDF document text
    • http://powerhdniy.space/who_said_absolute_power_corrupts_absolutely_quotebg9o5.pdfIn PDF document text
    • http://sellforce.ru/genie_superlift_contractor_parts_list075w8.pdfIn PDF document text
    • http://submonster.xyz/the_prayer_of_twenty_millionsey55c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_7078dcaf406a4dbc8120ce3cd68589f7.pdf?index=trueIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_4028169a2db64199a2720e9953f931b9.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_4a4b3f2811644bc2a668871ef43f5401.pdf?index=trueIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_1e54470d09374d3ab9c07de59f72d752.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_046cb20e8b594d5dbfff3608496c74b1.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 5364 bytes
SHA-256: 51f79815b0272f505af6116dc7d8155af593f660b3c095c78eb6e98b3afac069
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 10504 bytes
SHA-256: 872c426a984f16a2317711ab7dbe66cbe2539de76d36cc29ba8de5f181b43ab4

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