Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea6378e2d4724c8…

MALICIOUS

PDF

78.8 KB Created: 2021-04-05 05:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f8fc0031187d573755787af8b8a5f4bd SHA-1: c9f2e58b687ccb4af210f4ca1973ea693a73c0be SHA-256: 4ea6378e2d4724c8bb5f8a1865f31d89f7cc00cb911cda3e4f0819341812f9aa
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to a redirector URL (fokemale.ru) designed to host or distribute malicious content, masquerading as legitimate downloads. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a tactic to lure users through search engine optimization or deceptive links. ClamAV detection and ML classification confirm the malicious nature of the file, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/wix?keyword=southern+reach+trilogy+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60342349e3373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fcceb954f183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_600fc73f6eb8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_602958ea652a7.pdfIn PDF document text
    • http://nesobaka3.xyz/12583917204w2fci.pdfIn PDF document text
    • http://jirafka.space/boss_movie_song_djjohalvrdus.pdfIn PDF document text
    • http://outputqwvk.space/can_having_covid_raise_blood_pressureowt1o.pdfIn PDF document text
    • http://nonretloli.site/27860658488bbjnj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_602064b140164.pdfIn PDF document text
    • http://italystore.pro/ledanumitazdkdar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_603a7a9d8948f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5fcced03735ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxulija/how_do_you_make_a_healthy_smoothie_to_lose_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/brigandine_grand_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/97752642722.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/wujawurelew.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_cdd94b5772a642839f9ed778a7b5d628.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_a76ebff9dd6c4b29b3911cd49753e074.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuxime/10_best_android_apps_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/60719194030.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/60021879509.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/hen_party_invite_email_template.pdfIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_12349befddb6421fa65f01a59b0609ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/lejor.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_15f2d906075d407e8f210658f8c3651b.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_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 5444 bytes
SHA-256: 9dc01724e29aa2897d7df126d6571d3518ecdf2845bdc08a965920bbc0e2d417
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 11528 bytes
SHA-256: 84cc30c716399411d80d87797e27a1a0783ba5db3384775930676a738a2ce5f3

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