Malicious PDF — malware analysis report

Static analysis result for SHA-256 477d4edf752eaa88…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 05:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f6902dfaedddcb37a19991205e7b6bf0 SHA-1: 10844e60723f991a2f037ceecbfae483d52ce82d SHA-256: 477d4edf752eaa889ed59f6c808e23eda8877d021baefcfdb7f1a0afadd10235
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 a significant number pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links for SEO manipulation or to distribute malware.

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://seumenha.ru/award?keyword=testy+z+czas%25C3%25B3w+angielskich+pdf PDF link annotation
    • http://cloudplay.xyz/lizozirodisulotivaderfpa3p.pdfIn PDF document text
    • https://numokafi.weebly.com/uploads/1/3/2/6/132695525/85eb72630.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/is_ninja_a_good_blender.pdfIn PDF document text
    • http://dalnoboyi.xyz/sekonic_l-308s-u_flashmate_light_meter_401-3078vj1e.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/xesofijilugawo.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/65822813438.pdfIn PDF document text
    • http://raxewapikeb.mygamesonline.org/59597808057.pdfIn PDF document text
    • http://madokedaxemosu.22web.org/88410162890.pdfIn PDF document text
    • http://legalevi.22web.org/32317275375.pdfIn PDF document text
    • http://nuzalozipofeven.22web.org/8962206607.pdfIn PDF document text
    • http://helpcreditscore.info/dogadikotesorulawogufcq8fp.pdfIn PDF document text
    • http://sopidemeleket.mygamesonline.org/kifinogorukobal.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://zujisofivo.onlinewebshop.net/jeliboxufawanejukebig.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/flight_of_the_bumblebee_piano.pdfIn PDF document text
    • http://sedobuxekazadi.rf.gd/uefa_champions_league_2019_games.pdfIn PDF document text
    • http://rawozovikoruros.rf.gd/99_names_of_allah_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/nagamiwavov.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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 5392 bytes
SHA-256: bd062b0ba7405ab88faaeb43d8072d164adf8de09dec6273bd04ffaf649b9042
font_01_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 12720 bytes
SHA-256: 7c7acd768ecb149a38bc545db6f20cf0f7ef39c0cc31534c0d5f36f3f6c7ba9e
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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