Malicious PDF — malware analysis report

Static analysis result for SHA-256 4271533f2fc1663c…

MALICIOUS

PDF

79.9 KB Created: 2021-05-11 00:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fdf07a7f2f37898ab5419abed35cd659 SHA-1: a8447a7d93b9636a5983405e936a6eb7683517de SHA-256: 4271533f2fc1663c4722c0c686d23dac4c05897ed1a1326899fb3eed26ca7237
116 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is malformed and contains an exploit stream, along with ML and ClamAV detections classifying it as malicious phishing malware. The embedded URL points to a suspicious domain, likely serving as a lure for the user to click and download a malicious payload. No scripts were extracted, but the PDF structure and external URL strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=dark+magician+chaos+yugioh PDF link annotation
    • http://alkim.xyz/how_to_learn_english_online_free1htho.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/what_is_computer_programming_language_and_its_types.pdfIn PDF document text
    • http://visionnew.xyz/93317566399q0550.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/39505890685.pdfIn PDF document text
    • http://afterdealer.pro/816491746128huy2.pdfIn PDF document text
    • http://promoocaoameericanas.com/50424195143k2s8l.pdfIn PDF document text
    • http://igbusinessabouthelp.com/medialink_router_login_infonam48.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/pedometumelivirimijoveme.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/old_dolls_houses_for_sale_on_ebay.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/zoromexemuzid/turaxotido.pdfIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_23d08f8cbb77478080e01c6928071656.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_55332dcc41ec4bf6ae54835981698d5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/fetafizajexalatiwumemanow.pdfIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_9fbd4fda060f43f283112caafd1b048b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remeranexe/hp_officejet_8600_printhead_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/cord_cutters_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/12453453922.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_c7270c43142446d9acbc3df5d3157b42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/apollo_munich_health_insurance_policy.pdfIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_6c0d4164e56d43c383f4d4b967ea768b.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_57c53bf2721a442883c0c6f2b8b75a4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/best_programmable_coffee_makers_consumer_reports.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_d602edeceb2f43e4af4978d890bbf3e8.pdf?index=trueIn PDF document text
    • http://lexamokoxerum.atwebpages.com/25682475122.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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 5032 bytes
SHA-256: aabd7882d630e2dcd4f6a7386fa24780e97a75ac7bc235611b76f0d44c3b35d3
font_01_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 10636 bytes
SHA-256: 3bcd87964f6d5286c41a291f362158159a3b13590060939841ee9c9d4471818a
font_02_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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