Malicious PDF — malware analysis report

Static analysis result for SHA-256 b807f8cf93d09e1b…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 13:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 55a350206fc3bc10499710837cf0b9ef SHA-1: ab25b13c195a0090d015fb90dc54a38f017a16b9 SHA-256: b807f8cf93d09e1ba108b7face8fb52e4630a302f9a81706667d0560e58a3d55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of embedded URLs pointing to disposable hosting domains, indicating a link farm designed to redirect users to potentially harmful content. The document body appears to be malformed or truncated, but the presence of numerous external URIs and the link farm heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=graco+snugride+30+infant+car+seat+manual PDF link annotation
    • http://fevofawemuwa.medianewsonline.com/home_alone_somewhere_in_my_memory_piano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_5fe9b912ef96c.pdfIn PDF document text
    • http://mibafabujid.22web.org/where_to_drop_off_donated_clothes_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_604516369b625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_6009e57faa331.pdfIn PDF document text
    • http://zenarajare.22web.org/gordon_west_public_school_uniform_shop.pdfIn PDF document text
    • http://fuviguz.22web.org/how_dangerous_is_a_divergent_plate_boundary.pdfIn PDF document text
    • http://hurleyshamburgers.com/98482107083p13xw.pdfIn PDF document text
    • http://punubukotulanes.22web.org/58397511180.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/fundamentals_of_accounting_part_1_sole_proprietorship.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/naxomalubavosowijowizekab.pdfIn PDF document text
    • http://kartaidatodemeleri.com/31473399767kx3d0.pdfIn PDF document text
    • http://kemikavar.mypressonline.com/biotic_and_abiotic_stress_management_in_horticultural_crops.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494440/normal_5fccfffd58805.pdfIn PDF document text
    • http://zaxofebejip.66ghz.com/82873910.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://xuwabofori.epizy.com/50773265880.pdfIn PDF document text
    • http://pavosalilob.rf.gd/whats_a_lanternfly_look_like.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/nuvidetava.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/barcode_generator_freeware.pdfIn PDF document text
    • http://minofadejewezup.rf.gd/human-computer_interaction_defined.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/l_afficheur_lcd.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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 5560 bytes
SHA-256: eb4c484b92aa08f85659cd9af20e44f357fd0e13cbbe2580272223926770d422
font_01_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 10692 bytes
SHA-256: 725e2a10d957728402fb083b6bc308869854257981b3e1753c2c9b75afa5e09b
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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