Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e52a6a7d19dd57…

MALICIOUS

PDF

80.2 KB Created: 2021-05-12 18:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 204bab4ba49449c1badece2cf52f4f01 SHA-1: e2923059406e6790da33ca113fb06d3eaeb78bc3 SHA-256: b7e52a6a7d19dd57208e49bfc83f6cff587d6b62dc7d8ad8f3ce588702b98acb
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, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate attempt to create a network of links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

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://soxebez.ru/strik?utm_term=what+does+a+call+to+action+in+a+speech+do PDF link annotation
    • http://misstourist.info/29358137761cqsjd.pdfIn PDF document text
    • http://pubgmobiie.com/is_the_movie_winters_bone_based_on_a_true_storyphyku.pdfIn PDF document text
    • https://wedoweniwan.weebly.com/uploads/1/3/5/3/135308992/b2861ce.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/josasazugefij-fenufelepal-bazonatewi.pdfIn PDF document text
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/zunelaw_dopifujov_sozipaj.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/Q7geKji/the_mummy_returns_wikiquote.pdfIn PDF document text
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/pamodulupufarizinijo.pdfIn PDF document text
    • https://bisebisa.weebly.com/uploads/1/3/1/4/131406118/560030.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://powipawi.weebly.com/uploads/1/3/4/3/134313445/baposo_zefelifunom_fonem_vuxokogomubi.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/b8ecc9adaf65.pdfIn PDF document text
    • https://kefubawivamati.weebly.com/uploads/1/3/5/3/135304753/melarilejim.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/nwLiehj/58382862568.pdfIn PDF document text
    • https://xokejajolaliz.weebly.com/uploads/1/3/4/7/134718337/zomonemim.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/ZifcDje/color_by_number_online_hard_games.pdfIn PDF document text
    • https://sezowizubuv.weebly.com/uploads/1/3/0/8/130874308/ed62820527f.pdfIn PDF document text
    • http://intereriia.com/vodiwuvigisid8cxyn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6fad6a32-3235-425b-a2eb-b941a8690714/39836308443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45abe165-d7a2-43fa-9feb-fe9b25fc271d/52731897633.pdfIn PDF document text
    • https://3c1ad7ec-bfc7-452d-a92a-0d22078d3251.filesusr.com/ugd/c6e823_49ddc280370c48138075aff742e179e9.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_9943fe7c5778483e823cdc3fb1daa173.pdf?index=trueIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_74d0df4606894cd9b6bdd3939810aca8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb593e0-4472-4b94-a73a-4373e5e0d90b/what_is_the_best_cellular_trail_cam.pdfIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_64c79ae26c0d440e90d55571007418a2.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_212bd94f5f4f4524b4a00eefff95db97.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 4864 bytes
SHA-256: 7a6464ad1aa0df456f5b79d19b88d209615d186a61a6c94becc23c46ac2f64e5
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 10872 bytes
SHA-256: f73d21b1c8a3036e8897c79eff8d57662ae94d5b9183af51cf0eae47c89aa812
font_02_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333