Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38d50f3571a7a69…

MALICIOUS

PDF

75.2 KB Created: 2021-03-19 16:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 424a7a014021fc7a5b325521a1d037ca SHA-1: 9959b6fe6aaf549b63e859f4815514d48cd70d83 SHA-256: f38d50f3571a7a690a98d2a7f0c1213806d7fd8258608e1803364a442a0eba4e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://fokemale.ru/award?keyword=architectural+drafting+and+design+free+pdf PDF link annotation
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/4474018.pdfIn PDF document text
    • https://cdn.sqhk.co/salifera/WhhYb9y/aplikasi_terminal_emulator_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/Rkjgd25/jevizugoraxobedom.pdfIn PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/a5031e55a6a.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/96874129459.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/w0mjhQz/espers_ff12_zodiac_age_guide.pdfIn PDF document text
    • https://fomiradoxep.weebly.com/uploads/1/3/4/5/134512134/580031.pdfIn PDF document text
    • https://tovibibuxajewen.weebly.com/uploads/1/3/5/9/135968099/0720a929ab02.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/nutaguxamegemug.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/EuhTjaP/dragy_gps_meter.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/aicigih/santorini_apartments_for_rent_boynton_beach.pdfIn PDF document text
    • http://gebajajax.22web.org/35587356440.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/Iii2lhc/sabivalaxotajewemimepare.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/9104381.pdfIn PDF document text
    • https://voluwunuzusiju.weebly.com/uploads/1/3/1/4/131452861/dilidufaginine-xumetelivit-tujavoxelig.pdfIn PDF document text
    • https://cdn.sqhk.co/jefadata/Ajfjchh/54504466483.pdfIn PDF document text
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/10bdf.pdfIn PDF document text
    • https://cdn.sqhk.co/dilipokoje/gfjhNia/gangs_of_new_york_espanol.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/sapubuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasivirenum.rf.gd/herman_miller_aeron_size_c_fully_loaded.pdfIn PDF document text
    • http://xaxuvep.epizy.com/43572772920.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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 5408 bytes
SHA-256: 47d4fec68e2639ec1e5a64514ee7bfc8590ee082b3bceda6749ec4074f1da5d3
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 10096 bytes
SHA-256: 57e23030baba2b6428161aaa77c31f53dc552e593843ae6c3ae6ddfc84e8a871

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