Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd460fdff2820321…

MALICIOUS

PDF

79.3 KB Created: 2021-03-09 15:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 61db2a29ae963cc37ce57b740010d467 SHA-1: d85196bf21a85a5e467f815ecde68bedb14cb02e SHA-256: bd460fdff28203214c388dd55b53a651182fa17fa63d741c8a1f62bb25770fba
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including one with a suspicious domain 'midufefew.ru'. The document's content, though partially corrupted, suggests a lure related to an 'audit report', likely to deceive users into clicking malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://midufefew.ru/award?keyword=informe+de+auditoria+ambiental+pdf PDF link annotation
    • https://cdn.sqhk.co/jarixizotib/uigigje/gojazupimoz.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/DWnXibP/party_in_the_usa_ukulele_tabs.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/cC1BXRy/7685432007.pdfIn PDF document text
    • http://sneakerspapa.store/why_is_my_xbox_360_not_connecting_to_xbox_liven5fha.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/3hagfI9/helicopter_simulator_free_online.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/59941023503yfbnx.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/Sfgi3ii/wallpapers_for_laptop_hd_1080p.pdfIn PDF document text
    • http://texno3ua.com/desojujiwuzofalepabajufispo8d5.pdfIn PDF document text
    • http://ru-1.casa/murder_on_the_orient_express_movie_reviewsv4iux.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/ghQgfgh/pokemon_go_quest_june_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/hjtmhif/57501174250.pdfIn PDF document text
    • http://ses-paypal.com/chefs_choice_110_knife_sharpener_replacement_partsynf70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_62a83e293c3148c8b5fa9027c2c302e8.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_f447f660e6104027bae1def35aea8a4c.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_79350933dacc4cf9b2aa7a7682e7e983.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_09bb46b3cfb144abbf3d4acf6ff307fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/761adcb7-4879-4b7d-a547-bc330d349c61/33101604428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8b0028-5142-4322-8166-ac88da9e80a4/jack_and_the_beanstalk_the_real_story_dvd_region_4.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_ff8624a568884d8ebc38110463eb3103.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_4ae9aa3028ff4dbfa8038cad212ca38f.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 5088 bytes
SHA-256: 837a464e5de41bb74e3b410fb93080f8aceb8f374955787ff3bba42b0079f244
font_01_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 11464 bytes
SHA-256: c435b9f835a7de41b6638ace63799281659ab59a0177bc05e19a843d78a573b6
font_02_sfnt_off0001189b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 16192 bytes
SHA-256: 51e4c2aae56d1312e69a622a0a5a8680fe6d4008531f73cc2e2ecdc89e390001

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