Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8bce4ef9ab1f25…

MALICIOUS

PDF

75.4 KB Created: 2021-03-24 20:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ab1fea733a2d119f4fe12b93d7ef914a SHA-1: 8a0ce235226603ca5c80f351d490dc37ace4b27f SHA-256: bb8bce4ef9ab1f25a9eb6ee260858c487159cdce750ecbef9a53244e30aa9f3d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=aashiqui+2+film+video+hd PDF link annotation
    • https://cdn.sqhk.co/tavevalurov/GmnjfN7/animal_crossing_new_horizons_mobile_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/88Eibjc/xetexekerekikodimago.pdfIn PDF document text
    • https://xiduzejeg.weebly.com/uploads/1/3/1/6/131606953/1759339.pdfIn PDF document text
    • https://luvisumor.weebly.com/uploads/1/3/5/3/135390586/lekafuvoropiku-wubegomobavanil.pdfIn PDF document text
    • http://imm-shoes2.club/where_to_buy_canon_ink_cartridges_onlinexa5ic.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/JgeLpif/topujanul.pdfIn PDF document text
    • https://radugolun.weebly.com/uploads/1/3/4/3/134367443/tesibonigimif.pdfIn PDF document text
    • http://dwatches.site/bobekcsdfv.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/8862149.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/hG5jcha/diazomethane_formal_charge.pdfIn PDF document text
    • http://mbfsopg.com/jajasudokevegutekifagitelo7j74.pdfIn PDF document text
    • http://sfr-webmail.com/sda_fundamental_beliefsz64c3.pdfIn PDF document text
    • http://guitar.su/sansa_clip_battery_not_chargings2cd5.pdfIn PDF document text
    • https://cdn.sqhk.co/lukuvekeliki/giehdhh/17146172696.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/igjdASZ/launcher_3_update_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_1230b92ea84b45988c70aade4521346d.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_ba6d8f509f53410790c0418ccd8a578a.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_427d1ec7e515438589073ed7453025bb.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_79a3205314954bc3aae566cd54dea19d.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_5577f79f20e9414086d1b8559f19a663.pdf?index=trueIn 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_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 5360 bytes
SHA-256: fe3b76120fd45ef92fa43419481fb9d24d3cec65427140c85c6e595739a17fbe
font_01_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 11036 bytes
SHA-256: 1a09356296d7811f7feaf53cf7df7b78b60910e43a5991bf301075a5279c1105

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