Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd37cdc53f5a1c3…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 19:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01a85757fba46e808e9f616611d6edca SHA-1: fced14bbdb92396665a972e46e562ee6866a6bdb SHA-256: 3dd37cdc53f5a1c3233f0db6cc8c727e82ee942ed7bd2f9a1cded7facfa36755
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO spam or phishing campaign. The embedded URLs and the document's structure point towards an attempt to redirect users to potentially harmful websites.

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://golowaki.ru/123?utm_term=cover+letter+pages+template PDF link annotation
    • https://cdn.sqhk.co/dorejewibiz/bjeWzji/longines_conquest_carbon.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/BKBVhjE/my_city_dre_island_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/temududote/jgjixe5/adenomyosis_uteri.pdfIn PDF document text
    • http://fitokaps.xyz/vovonifirafibo1vsk8.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hVZ6sgi/mad_gunz_battle_royale_pc.pdfIn PDF document text
    • http://katermore.ru/buwevobapulosurtklvj.pdfIn PDF document text
    • http://qupieasy.online/xbox_360_error_code_e68_fixjxval.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/ibKnhe2/vufifewelemumukolotu.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/hggiuic/43069519280.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/jghcdid/secrets_of_the_empire_gameplay.pdfIn PDF document text
    • http://trikotoria.ru/canada_national_sport_organizationsve7g9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_3e06bbbacc8040428bc09464c9892d6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/lanaviginitenufetoxap.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_71fff3945bc1417388e1d83a26ece7c8.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_44fbe932496f425091d273c3e78047e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/54704069750.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_d2efaf9543f74857b69f31c93ca8c5d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/nisabovupevuraganunu.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_7b213aa04d8f49739e64abf0164aa599.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/12015042619.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/13410254239.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5104 bytes
SHA-256: 65035d92ab05152766e0b0c1fce00c8fe3ed7ebf140b16b793d4c7e929c93d28
font_01_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 10944 bytes
SHA-256: c4549cf1bbb46865e25104acb94aeb58634068e838c51fd3687a483172421eec

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