Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbab6faea2936cf0…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 00:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8334dfaff9e7d71d3287983d81a42b7a SHA-1: d15a9c73e5e0dbec6d243fef537ebafe1a0a161c SHA-256: fbab6faea2936cf004444488336962e141dec2a1c03739e67720e7c74038c1e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were extracted, the presence of numerous external URLs points towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=paper+bag+princess+costume+ideas
    • https://cdn.sqhk.co/wulozonixuf/shcMagc/a_periodic_waveform_has.pdf
    • https://cdn.sqhk.co/nazamesuwute/gWha3J2/snaptube_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4369769/normal_5ffcf13a06090.pdf
    • https://cdn-cms.f-static.net/uploads/4403127/normal_601a67fbd6282.pdf
    • https://cdn.sqhk.co/nivopekodi/jcuZidS/total_conquest_games_download.pdf
    • https://cdn.sqhk.co/rinugezig/pGVigjg/color_block_jeans_brown.pdf
    • https://cdn.sqhk.co/jalexire/hgehigh/97809619371.pdf
    • https://cdn.sqhk.co/jarogofef/mwcgjsJ/68096257123.pdf
    • https://cdn.sqhk.co/xovepejegosi/EgfFZdp/62254204512.pdf
    • https://cdn-cms.f-static.net/uploads/4421210/normal_60192ef67d7c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/420e5519-0d49-49c7-b256-1d7399f0e15a/glass_mineral_wool_fire_rating.pdf
    • https://uploads.strikinglycdn.com/files/ddddfd28-fc4f-4bb3-bca8-fc9ccbfffcb3/63072341757.pdf
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_4637535c96934b8582a57ef71abd8ffa.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_a3f7e293eafe4fdcaaf0ced44799def2.pdf?index=true
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_5e8281664db845bb9569d215a9cef7c6.pdf?index=true
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_c0577a0043ba4d91bfa87647dd856f05.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b678b8d2-e460-427f-b2e0-09fb76d6fd37/bugugibevumitutegoboz.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_585901061cc34bc79f8176778161a588.pdf?index=true
    • https://s3.amazonaws.com/retobifulipo/juxusugezuxobejosodalen.pdf
    • https://s3.amazonaws.com/vazisi/beverly_hillbillies_episode_guide.pdf
    • https://uploads.strikinglycdn.com/files/83f349f2-4e88-4a71-94cb-8979286f2e9e/why_is_my_router_not_connecting_to_the_internet.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/agnyaathavaasi_songs_lyrics.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f762.bin
f851041897734fc6dc01bb78b15b5fd5d431d9a73ac47b9d1e805ed1e4aed99b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 5500 bytes
font_01_sfnt_off000109f2.bin
8d1dad07f5f2cc3c7e538274e4b2b2c61a2c61bfefe51c267e38f2c3c98b4df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 11160 bytes

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