Malicious PDF — malware analysis report

Static analysis result for SHA-256 885ad03d576c811a…

MALICIOUS

PDF

73.4 KB Created: 2021-03-29 16:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6f716d81928653bea3ef9ccff8366049 SHA-1: f38a7f898c72b26030ac642748fea643726e0ca5 SHA-256: 885ad03d576c811abac9f0ef9d5178afb96fce01895e59538d8c40956f14f474
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, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a malicious intent to redirect users. The document body, though heavily obfuscated, contains references to 'colloquial dictionary pdf' and 'wkhtmltopdf', indicating a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=colloquial+dictionary+pdf PDF link annotation
    • http://operationhomeplate.com/what_does_dr._berg_eat_for_breakfastaaij9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460449/normal_5fc951cf8cae9.pdfIn PDF document text
    • http://nonly.xyz/56653153193oh68i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fcdbc7d4ad0a.pdfIn PDF document text
    • http://reduslimitaly-official.site/pazapujubenj5qpo.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/iggD2hh/carx_highway_racing_cheats_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_604d24c2608b4.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/iigcBGp/51596957139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_6058690f83d1a.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/jcdRgcQ/37230349098.pdfIn PDF document text
    • http://prosale.company/how_to_write_an_informative_outlinemtmff.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
    • https://s3.amazonaws.com/sojebelevenex/72769510971.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/mijizenijugoxifamonuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b838eb-ed16-4ddb-88e5-628a0fba6687/is_wayne_dyer_still_alive.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/jekadonusovanunimarib.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_776aabc8899347469f4aec971782f0c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da0ca8f-c650-4f97-bfc6-68d0360722ba/84366628432.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/how_to_start_a_not_for_profit_business.pdfIn PDF document text
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_0728de6f0d84422d987bf64eb4556114.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95e30bb-3ffa-4d9f-8604-eff48beed133/new_call_of_duty_update_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7857bb-5149-4e4b-bf25-83b52dbbd1f1/list_of_foods_high_in_complex_carbohydrates.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_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 4984 bytes
SHA-256: bbd9d8526b5c4d8318aefd286f01ed7275490ff0c31e1dccd89ce5179ebbce81
font_01_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 10744 bytes
SHA-256: 26876a0326cb16d27e7c11e418e88203d3a6525a97c34c3f6ec5353d5842ba60
font_02_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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