Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bb0ca046c628e3…

MALICIOUS

PDF

83.4 KB Created: 2021-03-12 21:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 109097c30e1ef7cc4bbd9c02afc46b70 SHA-1: d21c3496059becb9a59a0b3ef544e9989f63e0c9 SHA-256: 81bb0ca046c628e3b8ecb4b62a494388e2a6662759b65fcb98271d740bda267e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a distribution mechanism for other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/award?keyword=augmented+reality+abstract+pdf+download PDF link annotation
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/1753794.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/jh9higf/74486436147.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/2625990.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/ZRidTid/dominos_wake_village_tx.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/como_acceder_a_los_mensajes_de_texto_de_otro_celular.pdfIn PDF document text
    • https://cdn.sqhk.co/gigepiwej/jcRielI/policybazaar_bike_insurance_copy.pdfIn PDF document text
    • http://majikok.mygamesonline.org/fozumududub.pdfIn PDF document text
    • https://cdn.sqhk.co/vijamabaf/ahhXtJa/17081466558.pdfIn PDF document text
    • https://tevaxuxelajuri.weebly.com/uploads/1/3/2/7/132712575/7fb18e0eea2f44e.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/gipurogegaduba.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/haigJgg/flappy_crush_mod_apk_unlimited_money.pdfIn PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/bewapeletepisawurazo.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/icagijg/vaguwekisixevofigijijiga.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/ddBiija/28764579385.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/higj5ib/nijoxararevewaxozone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepevalir.rf.gd/laruwazatopisege.pdfIn PDF document text
    • http://lusitenaburasow.epizy.com/where_can_i_go_to_get_a_cortisone_shot.pdfIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_e0fc19ecc4b0437385d1ad3dc919f554.pdf?index=trueIn PDF document text
    • http://nevigewiba.epizy.com/cavalieri_s_principle_worksheet.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_9495e4fc5b2148f39d4bcfc39502ea9c.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/damajarivifibez.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/dekisuzawe.pdfIn PDF document text
    • https://f516a5e5-1936-4b34-b436-a929b3a34b8d.filesusr.com/ugd/774001_ba2c143cfd724c118fa3edd7a9b946cd.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_1528a23595dd4777b28cba3830ff8d82.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 5796 bytes
SHA-256: e413ca4d9c79645b505575983649282b9635806451e15b81c3c1c74153bb9897
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 10016 bytes
SHA-256: 3b97d39c909f763229ca9f8cc622d750cca5037e87e779e3aef0502cfe7c4df6
font_02_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 16120 bytes
SHA-256: 88439519992b54a76c49e1773b2988ac0eb869403dfb9e9ab63ea25f7580dedb

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