Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07b064619d603d6…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 04:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7bf12c5738df61daa32e0f6e2ae291c7 SHA-1: 1a4e34383aca0243107eee782ec3c71ed6c2d3cf SHA-256: a07b064619d603d6d342a7264ed495b50aca9272ad62fd9a103e46f8178fb662
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=computer+networking+tutorial+for+beginners+pdf PDF link annotation
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/bcbca.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/Ejhg4z8/vedabubexaxovinevikepaw.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/Njdje7z/tovezifulenadumaxilofa.pdfIn PDF document text
    • https://gumotamilo.weebly.com/uploads/1/3/5/3/135319527/gesugubumaxeleli.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/sixorokekibe.pdfIn PDF document text
    • https://ninapivojejuru.weebly.com/uploads/1/3/0/7/130775346/c292e111c61904a.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/MWidgdw/romozekanatuzubenibo.pdfIn PDF document text
    • https://dulifemubal.weebly.com/uploads/1/3/1/3/131398350/nuterasubo-jezawomasatef.pdfIn PDF document text
    • https://fekifefexil.weebly.com/uploads/1/3/0/8/130815726/532d25eced30.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/g8jvido/game_city_racing_lite_mod_apk.pdfIn PDF document text
    • https://ludiwutigavas.weebly.com/uploads/1/3/4/6/134697468/bimuremogujijug_tironododelidot.pdfIn PDF document text
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/f3e4d01f9a69f0.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/TdKGFUK/95757193220.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/Urqiejb/stickman_skate_battle_online.pdfIn PDF document text
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/remosadazefegu-gidokaxi.pdfIn PDF document text
    • https://pimotaro.weebly.com/uploads/1/3/3/9/133986821/xefiluvirexup-zikamo.pdfIn PDF document text
    • https://nodudoweg.weebly.com/uploads/1/3/4/5/134599631/sesazanita.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/wobomowuwarija.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/jt4igi0/81984050384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70bc83f-1d91-4404-b904-658b649f8d0c/gazifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfcf565-61e7-4e73-bf3f-b2befdd07073/31587801979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168e3da3-d8c6-4cf5-a604-a76a7e9de0c2/hitachi_c10fsh_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c2b68b-d06e-42bc-8ccc-8c2a191b520f/webixukawenob.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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 5560 bytes
SHA-256: cce6c44fb6f336fb30918e53aaaac6bccafb12bd6c65f3035867a35f3a17152f
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10040 bytes
SHA-256: 88647cb06fb68ec53e62568587787aafa4ad843992e9d06c025f9962acae24ee