Malicious PDF — malware analysis report

Static analysis result for SHA-256 634a473577bd33d5…

MALICIOUS

PDF

77.0 KB Created: 2021-05-07 07:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 753c0996c75177631b31532209b6a59a SHA-1: 29ba7500741b88aad5c2e04699de33004942ad93 SHA-256: 634a473577bd33d52a00a6cff6bc932ae8d1eb42bb7b2346a07005f13d6689e4
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically using a 'keto recipe book' theme to entice users. It contains a large number of external links, many pointing to SEO redirectors, which is indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=keto+recipe+book+for+beginners PDF link annotation
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/DkIieow/39902417358.pdfIn PDF document text
    • http://buyfastedcircle.xyz/vuloxazepotibafedokjfvt.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/hjh5Usc/nrj_smash_hit_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/hgeEYtu/25646264402.pdfIn PDF document text
    • http://boothattendant.com/78722578852cs1h3.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/cifihbv/dewodewujomonidosifenexal.pdfIn PDF document text
    • http://coupons2020.info/fepedokegigifotzrwk.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuguxovim/XTqS4B5/classic_rock_radio_melbourne.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/zoromexemuzid/albinism_facts.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_f796d43e9d6b43d993aa1d889b215cd9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/likuxewej.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/nidabowasoledoxokuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/my_cousin_rachel_trailer_ita.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_d916f7dc22de4e45ac42af5fb0d87bb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/buxufekepam.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_7cce649d067e436485b96412a216d0f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/cisco_router_2900_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/divina_commedia_inferno_canto_3_riassunto.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/peaky_blinders_s1_full.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/14194059951.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/71805360347.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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 5116 bytes
SHA-256: 72ef9db908d2f42018c17c8a1d6f775c81556eca6379a1b37dd297ade73debfe
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 10640 bytes
SHA-256: 397e7898d3a2a4b4feddec8e55ca6090c241f602fa66e2e45f4ebdf57d0924a2

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