Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ca8fc3cebb51b5…

MALICIOUS

PDF

81.7 KB Created: 2021-03-22 07:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 8d713c81b063db7a6a060a10b519dfe2 SHA-1: 988babe30e695c23217522a2b496871c3fecb479 SHA-256: 73ca8fc3cebb51b53530181cf7d5ebfa4401a09c35c99d1f7069bf6603c593c4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous external URLs that likely lead to further malicious content or phishing sites. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to manipulate search engine results or distribute harmful content through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/wix?keyword=car+x+drift+racing+apk+mod PDF link annotation
    • https://cdn.sqhk.co/tuforalogidu/hehaYjb/alchemy_spirit_definition.pdfIn PDF document text
    • http://webpost.pro/15783157872vyh4d.pdfIn PDF document text
    • http://copyrightmediahelp.com/9518347611065fr5.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/dsifhja/15156906453.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/jbjchcx/bee_backpack_toddler.pdfIn PDF document text
    • https://cdn.sqhk.co/xizowabik/hh3gigh/international_arbitration_act_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_d1ac9f2f862d4426ae1b7d901971e900.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_544abecf58c944ab8b2f6da04028a982.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_a7b5cb5c1332405e928b67ac33d8da32.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_25697a9e979a4a5881f949de3ca313a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ditiruz/localization_strategy_in_international_business.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_d5768f862e6641c6b54754f12ae4149b.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_078bb2b8163648be8579075bb1ab612c.pdf?index=trueIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_cc744d2c4ae44a2697fd5f4b7242b7f2.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_91b82cc742e44348adaa9ee0967eba1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/avr_atmega2560_datasheet.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_3d9c2ce67832485bb452b3d6d32a12fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/baldy_education_game_free.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_798569a24d21403e9f4effa80fef3b10.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_0ba7bd85506d4e1baef0bef6589440c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/56641770289.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_5f9bda278f9342d189713bebf3672fbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/67302569627.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 5300 bytes
SHA-256: 72d79f0fa26fa32d97302f3ca183ba92638f4dd9ff2fe4e34e5b4658143a4b00
font_01_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 11648 bytes
SHA-256: a970539dd89c5d8e6d2fabfad7a89ea0a0cb05bf653f2469e0aa981c662cd412

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