Malicious PDF — malware analysis report

Static analysis result for SHA-256 583b294b28f2471a…

MALICIOUS

PDF

135.4 KB Created: 2021-03-10 03:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 08ac698310e69736976ce3b0ba63fb0e SHA-1: 3ba1740abd3a88fa05733775cc01beb0169ead70 SHA-256: 583b294b28f2471a7ca8b988458e68e76342dec10d0914b5906390d2b5c92af4
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 0.9993

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://maypoin.ru/award?keyword=advanced+language+practice+heinemann+pdf PDF link annotation
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/fufepuginenawi-defipadararogu-bejifozi.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/wuzinirobad-fegitafemaxep-mifom-zirijamizuze.pdfIn PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/2087039.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/porter_cable_c2002_regulator_repair_kit.pdfIn PDF document text
    • http://favunewesazut.sportsontheweb.net/el_cuervo_de_edgar_allan_poe_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/xexogataza/4r2igij/24597918291.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/ewBQshh/sanigodimuzapili.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/e0Aid2R/kefilumejogimaf.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/pufopisaxamovume.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/kupek.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/gizwyPa/d_d_dungeon_maker_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1adbf7dc-3554-4c68-8465-6ff6db008d0f.filesusr.com/ugd/f34823_af53914bcc7043ed894127f194ab15b8.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_2fea60693654410897cbf62742868c15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezonijida/70139103705.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_7b6f56a6c6a14003a56883a2662b296d.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_57010278b58e478998ac97e6cc137bdd.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_2d8d70e5199943d9bd52ee74ebed2241.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_b0f12fe9baea497a8e9fe8e315bcc736.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_cf0fa06d5349439181f7340290756f53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/perurulexi/segebuxiw.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_6969bf6ba2f04d5fa38ab5a48a6e099d.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_28556ccdbc274e4fbb35a171d49c5888.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/outlook_app_pictures.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_off0001d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D833 5440 bytes
SHA-256: 2703e2d401a3109878eefae32e804498663a11ed5ca2c138481792b0d43ce2f9
font_01_sfnt_off0001ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA95 10948 bytes
SHA-256: d935ad51152db34c697e1213318664f33cc0f9e9f4a4714eb8f5951a04018eea