Malicious PDF — malware analysis report

Static analysis result for SHA-256 911e6bd68a2bbf44…

MALICIOUS

PDF

86.1 KB Created: 2021-02-15 20:07:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2149494fb7c5002aba9619d20a59f607 SHA-1: a323390626348d4d3d0a61c885d047c42cf6828b SHA-256: 911e6bd68a2bbf441fbd8e9611d04ad0cc1ffdb3c6c83bce24e8fbce81fe1a28
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though partially corrupted, contains text related to movie release dates, likely a lure to disguise the malicious intent of directing users to the URL 'https://jacksth.ru/strik?utm_term=fifty+shades+of+grey+freed+movie+release+date'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=fifty+shades+of+grey+freed+movie+release+date PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5fe07527c0cd8.pdfIn PDF document text
    • http://chatik85939775.fun/pitch_black_afro_songsqvr82.pdfIn PDF document text
    • https://noverike.weebly.com/uploads/1/3/4/3/134349253/2017716.pdfIn PDF document text
    • https://vefiwuzozubeki.weebly.com/uploads/1/3/0/9/130969791/nebado-xedagifugu-bekewo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420238/normal_5fef00783e634.pdfIn PDF document text
    • http://save50it.pro/wonoxekovuvulitumesijopunft46c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_601995b321319.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/a948f602e83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451744/normal_5ff801d0b89da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_602210c15cb28.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/fgjiajd/50966432259.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/btgejhQ/cat_runny_nose_drooling.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/kosirob.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://xuwewajefifa.rf.gd/greetings_in_english_worksheet.pdfIn PDF document text
    • http://nowesiredud.epizy.com/al_quran_rasm_uthmani.pdfIn PDF document text
    • http://vufebadavoga.epizy.com/crusader_kings_2_guide_ireland.pdfIn PDF document text
    • http://niwuganol.epizy.com/neoliberalismo_chile.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 5120 bytes
SHA-256: d714ff7b4b3a4a1801fa803a89bd3fc7b17886634e1213f270927f67b2c7fb0e
font_01_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 12788 bytes
SHA-256: b0c9ff3db4ffb0908a88b51c3452a519b4d7e02c790a5c70f66e3f52842a3a19
font_02_sfnt_off00013c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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