Malicious PDF — malware analysis report

Static analysis result for SHA-256 207e9ac4ad7e0bf7…

MALICIOUS

PDF

77.1 KB Created: 2021-06-06 06:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f00e323233ad143461aa836f0821e8b0 SHA-1: daa1a0db1fcc04f926f347c860ae0230f41112f4 SHA-256: 207e9ac4ad7e0bf7f2310f7f24932e1126b345d7982f51dda62e1a8cfeba9666
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm to direct users to other malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit users through these external links, potentially leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 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://cructi.ru/pbw?utm_term=describe+an+experiment+to+determine+acceleration+due+to+gravity+using+simple+pendulum
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6040f29445f1f.pdf
    • https://cdn-cms.f-static.net/uploads/4444644/normal_601f241a7a422.pdf
    • https://static.s123-cdn-static.com/uploads/4368503/normal_5ffe0f664c616.pdf
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/tobikegorepaxademik.pdf
    • https://cdn-cms.f-static.net/uploads/4460066/normal_600ecde65435d.pdf
    • https://cdn-cms.f-static.net/uploads/4498893/normal_6051297edc12f.pdf
    • https://fagedudadisex.weebly.com/uploads/1/3/0/8/130874641/jarojeset_xarokelekufal_xozoxikevewe_gutukebu.pdf
    • https://xonovezalewame.weebly.com/uploads/1/3/4/4/134489084/vekukujamizije.pdf
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/solufemijenefagol.pdf
    • https://static.s123-cdn-static-d.com/uploads/4405903/normal_60b2730110d01.pdf
    • https://dubonizu.weebly.com/uploads/1/3/1/6/131606556/budakev-tabebod-konojoxeno-fukatiwokidu.pdf
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/lorotobopi_naraja_sojepudoxo.pdf
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/mebiderivew.pdf
    • https://cdn-cms.f-static.net/uploads/4411691/normal_6038c97fc3587.pdf
    • https://cdn-cms.f-static.net/uploads/4467287/normal_6009dae09c859.pdf
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/ridije_pufisadere_wirubuw.pdf
    • https://static.s123-cdn-static.com/uploads/4387054/normal_6005caa1d2cf3.pdf
    • https://kodowororebuvos.weebly.com/uploads/1/3/5/3/135392879/xipasabowosejemogen.pdf
    • https://gijidibeb.weebly.com/uploads/1/3/4/7/134702067/sexikowavamibi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dekokos.pbworks.com/f/what_does_a_moca_score_of_13_mean.pdf
    • http://tarogifere.pbworks.com/f/xuzumarifal.pdf
    • http://sipibujewadu.pbworks.com/w/file/fetch/144524946/29232757758.pdf
    • https://uploads.strikinglycdn.com/files/31f8568c-578f-4c07-be26-ff8b17807b51/how_to_put_together_a_zenna_home_tension_pole_shower_caddy.pdf
    • https://uploads.strikinglycdn.com/files/37ee0950-b2dc-4fd3-a6e7-c87ba03d4d2b/tokanirafo.pdf
    • http://jujirafamena.pbworks.com/f/38100557543.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbf.bin
34ae2224e2fe0f5fde0205dcf2732a062404d6174d2fa574f5b9b96b40d1224b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 5760 bytes
font_01_sfnt_off0000ff5a.bin
4b2e4794659297a881e18c38bb49697207ca97bd6254cb0fb9c57c853bfecab6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 11304 bytes