Malicious PDF — malware analysis report

Static analysis result for SHA-256 897adb5a4d9b08ac…

MALICIOUS

PDF

81.1 KB Created: 2021-03-29 12:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a79780eddb259e21dac840b925299472 SHA-1: 0fc0e3cd2d57038162ddbcebeb8b4b00ae454edb SHA-256: 897adb5a4d9b08acf2e0ea1fe6edc83d32e0236ddb50bcec0ac2cb2d0163ca56
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content. It also contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate further compromise or phishing.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ponafet.ru/wix?keyword=chrome+driver+download+for+selenium PDF link annotation
    • http://vopibuxipem.22web.org/57730835180.pdfIn PDF document text
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/64499d.pdfIn PDF document text
    • https://tonusawojojumo.weebly.com/uploads/1/3/1/3/131384735/sabubufudamije.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/PtibNH1/grid_photo_maker_for_instagram_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/aghzpjh/85291952903.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/9dcb912d7bedd.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/poxulopop.pdfIn PDF document text
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/9123181.pdfIn PDF document text
    • http://xojavuwolow.22web.org/lirukobomudexumex.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/996890.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/JspiiYE/toziwasabi.pdfIn PDF document text
    • https://xaredoluvowa.weebly.com/uploads/1/3/1/8/131871785/1450735.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/heVhbhd/64554460971.pdfIn PDF document text
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/xevug-labifelefilu-fabulevoxo-pivobez.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/bekuno_josukegogag_nimuxanowokapew_gejibut.pdfIn PDF document text
    • https://menudapopejit.weebly.com/uploads/1/3/0/7/130775932/8550623.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/87b209e6c.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/ligjfhc/story_of_a_gladiator_ps4_trophy_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesitari.epizy.com/ansys_2020_tutorial.pdfIn PDF document text
    • http://kisitibonadal.rf.gd/xelekalulavevugugabow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8040fbd-89b0-4966-83d8-eb3df225edec/wefusizobovopiruluvude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d846b3b-104e-43c3-8f81-c05786a2d310/is_vivitar_a_good_drone.pdfIn PDF document text
    • http://konapawejiwevin.epizy.com/vedefolepagolut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6606f1a-a41f-4573-b0fd-1f99212dfe3c/59664475728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53643533-c05a-4956-b000-8bc4f7f37f66/29448790246.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_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 5204 bytes
SHA-256: 34db3ae15c62bc69fb575a90b44d53d791428ad015e8e35f246f30f676803e7e
font_01_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 10844 bytes
SHA-256: a986bef4598794ab0f21cca1b06bc93cd823fade32b5d5cbba00648a87efe460

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