Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e41f3d8b73da29c…

MALICIOUS

PDF

108.6 KB Created: 2021-01-28 01:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fc0ea38f7bcf96739d7fb6979dc3e677 SHA-1: 953729849c2d92d794593f21c69f1039f2f485ab SHA-256: 9e41f3d8b73da29c319d99fdc5af29dd581c58d273db886a2cf06b8fe56d45cb
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a phishing or link-farming attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users through embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=wiz+khalifa+son+age PDF link annotation
    • https://cdn.sqhk.co/mugolino/jeja3ja/upcoming_fighting_games_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/z7Fjmii/artificial_intelligence_penny_stocks_under_1.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/DbwX9ib/hitman_s_bodyguard_2_full_movie.pdfIn PDF document text
    • http://stnold.com/how_to_make_viridian_green_acrylic_paint0oblk.pdfIn PDF document text
    • http://suzaxikuzexaw.66ghz.com/wovaxatazibebuv.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/0MBidgj/spotlight_room_escape_level_2_safe_code.pdfIn PDF document text
    • http://republvinb.fun/precision_audio_dothan_road_bainbridge_gauyhdj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_5fd101d2b2905.pdfIn PDF document text
    • http://micrometerdigital.xyz/56753187061mqbwl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fcfa40952070.pdfIn PDF document text
    • https://cdn.sqhk.co/govulasem/eMicjcd/52701597748.pdfIn PDF document text
    • http://uspeh.icu/poop_dollar_workaholicsx3rlj.pdfIn PDF document text
    • http://tonagruz.ru/jejomobuzafevorugamuahmtv.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/ibhija7/assistive_touch_for_android_4._1._2.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/mefovu/14584981321.pdfIn PDF document text
    • http://zefumegidadaj.epizy.com/wuvof.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF8 5060 bytes
SHA-256: 41ebd767db94294475ac53f007a0a843eb9cc51aa88b04307da503187c727cb8
font_01_sfnt_off00014f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4D 6660 bytes
SHA-256: 1b6fb77b83c882ef9880ea43bca6fe9e82e424c5d2b124d21f7c93fdecc6e6a2
font_02_sfnt_off00016692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16692 11804 bytes
SHA-256: 924216f7b81d21e212e828492ccb736db88c198ce9e3ee215e5f23cd837347b8
font_03_sfnt_off00018ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ED6 16392 bytes
SHA-256: c9b9d40238817e9fd1c0b290bb100284b8f2d9dcc1188338581b9d27efa8fa30

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