Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc287dff48780454…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 08:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ae6c32d155c453498268865dba3716fb SHA-1: a66e58662675656d8f8aa8fe63812db289f5338b SHA-256: bc287dff4878045499c342391bb09776c2258e17ce5ef71c23d2b185bd16c008
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/award?keyword=python+language+reference+pdf+download PDF link annotation
    • http://zurujavurobe.scienceontheweb.net/17476363251.pdfIn PDF document text
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/woxogivoseziv.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/65167501311.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/2cec46.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/54772904202.pdfIn PDF document text
    • http://xagixowedobosab.medianewsonline.com/what_is_the_meaning_of_apostolic_succession.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://sorisavitekinuj.onlinewebshop.net/daxosozejofoxawoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78653637-ad7d-4566-b49a-535d2b8fabe8/how_to_turn_off_smoke_alarm_beeping.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_3bc204a594a846c8b99d8289a67da5ae.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_3c4a111ad58240ee904ba76b79193e9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/73506941724.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_19db9860a6de41c9a77de2debe08f01c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30700ab-f88f-47c5-844e-74a6f47ff018/burger_king_logo_generator.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/29780483525.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/latitude_e6410_drivers_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea636b9-f577-476f-9d7e-51da0327fefb/wiralexofudikomonazazupin.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_82a95248d6e245e2a64ce9bdf9eb7ec0.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_8558549f79ed49eab559b7ec65bfa380.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7268760-96df-490e-901b-e056d34aa0ef/imaginarium_express_mountain_rock_train_table_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/4499297474.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/amazing_grace_chains_are_gone_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae2a72d-2aee-413b-ad66-0dd1583cd4b7/4483968060.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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 5268 bytes
SHA-256: 0dddd07d13695ae82a0cf77cadfd07f78abeb7f6da4ec45f1ffa051b6fd7ddc5
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 10836 bytes
SHA-256: 94efc4961224634a100bf542aa1681aa579e6881676eca7c65175ffe76cff194
font_02_sfnt_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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