Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8abcfb38128a92…

MALICIOUS

PDF

88.3 KB Created: 2021-06-14 12:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe29082648444db035f5f1efcbb8300e SHA-1: c921609237b8be6f02ae6618e687a6d1270a682d SHA-256: 3b8abcfb38128a92e8a983cd7b970fa395306205f3585856cc0c43f65cad3c62
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=happy+birthday+bhai+status+video PDF link annotation
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/powugojaliremiso.pdfIn PDF document text
    • https://vibusipapomokij.weebly.com/uploads/1/3/2/6/132682711/xaxagurigufaxebunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_60562b0621877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_60634b97b8999.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/672627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_6028e98f5649b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489033/normal_5fec6818df146.pdfIn PDF document text
    • https://lolosovosozo.weebly.com/uploads/1/3/4/8/134882251/votawod.pdfIn PDF document text
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/f9045913fe0.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/bemipogosivufitig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_6043101565bb1.pdfIn PDF document text
    • https://sozatugija.weebly.com/uploads/1/3/4/8/134859818/kelobogadod-wanudu-juxubizax-morem.pdfIn PDF document text
    • https://gevofiku.weebly.com/uploads/1/3/4/7/134759045/febogizug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wixudes.pbworks.com/f/masajozasos.pdfIn PDF document text
    • http://bulafiko.pbworks.com/w/file/fetch/145249809/sbg6580_bridge_mode.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144518637/kosajosuzolinurixelun.pdfIn PDF document text
    • http://lijunew.pbworks.com/w/file/fetch/145025823/48047769413.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/28081975546.pdfIn PDF document text
    • http://wigonewakil.pbworks.com/w/file/fetch/145195830/firemabasenazipoxusumozez.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/how_to_fatten_up_a_cow_for_slaughter.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/85204739045.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/f/zatuwizagej.pdfIn PDF document text
    • http://milatufed.pbworks.com/w/file/fetch/144776352/99284705040.pdfIn PDF document text
    • http://vogivakazela.pbworks.com/f/nuvabumobi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 5052 bytes
SHA-256: d6b3a000f078d514bb9f3d36d6451fa6cefda94bdf3930949b276d82b81dcfc2
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 10684 bytes
SHA-256: 11b2230e0f5c32a4a1888b2d60f64b04d1f6c96f75681eefa085f76b6d6d4ad9
font_03_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660
font_04_sfnt_off000142e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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