Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6905b94e9a1248b…

MALICIOUS

PDF

78.2 KB Created: 2021-04-08 03:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 808bc9888f63499d9fac22fca0facf69 SHA-1: 59a38508956f7c16686730a2188598ae3f62edcd SHA-256: b6905b94e9a1248bbbc885affc85cac1e917abfc462413df9197bb7ed5668956
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=has+voyager+left+the+solar+system
    • http://larumutul.getenjoyment.net/any_to_dwg_converter_software_free_download.pdf
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/c71a4417fa7.pdf
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/4268131.pdf
    • https://cdn.sqhk.co/simunenij/PgdBhen/siterulezivawovumu.pdf
    • http://fupemagis.mywebcommunity.org/amplitude_modulation_experiment.pdf
    • https://vumenaxusavow.weebly.com/uploads/1/3/4/6/134600171/1973278.pdf
    • https://lirejodeju.weebly.com/uploads/1/3/4/6/134628820/bugeja.pdf
    • https://cdn.sqhk.co/levowexesu/uhd0ihZ/how_do_you_get_mini_games_in_gardenscapes.pdf
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/zarubuvobivijax.pdf
    • https://cdn.sqhk.co/jesisuvov/RIgdhep/bollywood_flute_ringtone_2020_download.pdf
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/mudalu_rumuzogunal_naziv.pdf
    • http://rowaxamapitowej.getenjoyment.net/33304091997.pdf
    • https://cdn.sqhk.co/vixuzemabad/dcgfBjb/commuter_rail_boston_to_newburyport.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/kavefugekijoxerutu.pdf
    • https://cdn.sqhk.co/suxupijisajo/ieAj1hf/54780340629.pdf
    • https://xikubafol.weebly.com/uploads/1/3/4/6/134607040/de60f3c7df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_b8ef2189d1454ebea0893467985558cc.pdf?index=true
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_79496f3fdd754f0b812390466b0b642d.pdf?index=true
    • http://patudesaruvob.atwebpages.com/anatomy_and_physiology_of_the_eyelid.pdf
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_2059bee864a346d7ad6e970df041f819.pdf?index=true
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_d59fa16a259e476e8a689ffd9bb4e0a1.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d3.bin
379f6627ec7c9b367a0b0ae8e3711107869be7d2a4db71a883f633d82661b5e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 4940 bytes
font_01_sfnt_off0000f7ad.bin
9d2ce9cf5c8861f3f6319d75e3fe9fbce1c80b988d8c25386ef0f7c65aa29fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 10480 bytes
font_02_sfnt_off00011b7d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 4324 bytes

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