Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f4a1bb1ed31b32…

MALICIOUS

PDF

74.3 KB Created: 2021-05-12 09:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 30f959ec45f566ff854915556aec7afc SHA-1: 6b4b26400898e0ed12d2b6e6057a3f1cd786ec18 SHA-256: c8f4a1bb1ed31b324a4218af8bfe96197b51bfd304bf4b2132bc81e3af1e4660
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to a popular book title, likely to trick users into clicking the embedded malicious URLs.

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://seumenha.ru/strik?utm_term=diary+of+a+wimpy+kid+rodrick+rules+book+pdf PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/YkKwhaX/18250826148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_6017b1fc34b3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_5fd1852d73e60.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/hihffgi/icymi_urban_dictionary.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/fopotun.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/4uggibp/muxife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5fd15a6768da6.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/7mgYoqs/escape_jail_games_2_players.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_606ca6cec003b.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/zebodetefufokubejerofeg3zac1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471959/normal_5feb4431c2643.pdfIn PDF document text
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/ccad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fd272cd4b712.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/e094c3.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/WWge5Ny/free_3d_mannequins.pdfIn PDF document text
    • http://accueilcmb.com/51385932584cyu8s.pdfIn PDF document text
    • http://hookup754.fun/juvuwuzivijigugakezeba4reeq.pdfIn PDF document text
    • http://leyloften.online/gekor21tja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_60511a56620c7.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunadegu/mYDiUdk/pegijaxusiwowijumobof.pdfIn PDF document text
    • https://cdn.sqhk.co/pubusudes/jizctgc/best_mountain_bike_accessories_brands.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 5696 bytes
SHA-256: 516057c4083f958e0dff70c8da2e8b941aa132dc3e97481596bb4c05fba6e45c
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 15796 bytes
SHA-256: 56ac90718db887536c7255c86f23feb5e5d833422a65a149e92f8c4e09b8d596