Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ab97ed68b293d2…

MALICIOUS

PDF

84.3 KB Created: 2021-03-05 08:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a46de9fdaa430e71304d2f9db9c27254 SHA-1: ee0d8c7c0a12c55531921f331826e74c8855bc88 SHA-256: 57ab97ed68b293d2fa24821e81d211cbc9bad5ec600cb0e718e560d76e2215b9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://jottigo.ru/award?keyword=data+structures+and+algorithms+interview+questions+for+java+programmers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372963/normal_601333c59093e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_602e606f9c1b4.pdfIn PDF document text
    • https://cdn.sqhk.co/xenetomapum/RLS9MQ8/epic_games_support_rocket_league.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/002f617650f5.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/eXhdhiD/pepunekakodaval.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/eghHljd/cual_sera_el_pase_elite_de_noviembre_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/CgijaaH/events_near_me_october_3_2019.pdfIn PDF document text
    • https://zibozofos.weebly.com/uploads/1/3/4/8/134896422/879e7f3a.pdfIn PDF document text
    • http://vafojonigovav.iblogger.org/gexararaxajepolizit.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/ijcvjhd/samsung_smart_tv_guide_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_5fdab510bd7f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464861/normal_5ff7ca0aa621f.pdfIn PDF document text
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/kozaruf_redodujiwiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/jaMvggi/super_hero_fighter_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/iiUB6hg/spy_game_online_stream_deutsch.pdfIn PDF document text
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/074673bb360db7.pdfIn PDF document text
    • https://defeluzeveloj.weebly.com/uploads/1/3/0/8/130873982/mukepisexesu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kutoduno.rf.gd/how_to_read_korean_books_online.pdfIn PDF document text
    • http://pasalalu.rf.gd/easy_bing_maps_er_7._25_crack.pdfIn PDF document text
    • http://zelimasiropaf.epizy.com/nonidikisutoxifi.pdfIn PDF document text
    • http://paritoxo.rf.gd/gb_whatsapp_2019_iphone.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 5920 bytes
SHA-256: 490dfaae629cfc986584a456506cea4a724418e4f4b62f080ad1cd1e89025a8e
font_01_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 10240 bytes
SHA-256: f440bd324ade3df21e33daceec2c47a711dfe56455f97d28d1e844603144ac17
font_02_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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