Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f979148b2b6f734…

MALICIOUS

PDF

73.4 KB Created: 2021-04-08 02:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4accf833c97490e5c32c696eb83cafd6 SHA-1: 6ec09e5fea43997d6946da6bd4782ee79a0dd385 SHA-256: 4f979148b2b6f73433b372d9bb3f348d8596d6e59f887d8d9c2effff31e6563f
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute other malicious PDFs. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure for downloading a "war book" PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://fokemale.ru/wix?keyword=libro+cuarto+de+guerra+pdf+gratis PDF link annotation
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/xubop_nadaku_jezisilami_puzevages.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_6002777e47b58.pdfIn PDF document text
    • https://boduburul.weebly.com/uploads/1/3/4/6/134654649/af4a2c9a0910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_6004d918e0d71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fda92e030c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_5fda96cbcfe57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_6029e306ada18.pdfIn PDF document text
    • https://xuwulusepe.weebly.com/uploads/1/3/5/3/135310973/1424628.pdfIn PDF document text
    • http://haifaiv.ru/93563581674btyj0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_60589bca71238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394072/normal_5fde782d255ab.pdfIn PDF document text
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/xovope_wusidiwafimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_604e0afc88cb1.pdfIn PDF document text
    • https://ludikunoxor.weebly.com/uploads/1/3/5/3/135345671/b886e643423691.pdfIn PDF document text
    • http://topsalon.xyz/ross_stores_openx5pco.pdfIn PDF document text
    • https://panusefebile.weebly.com/uploads/1/3/5/3/135331690/nixoxu_sugep_vafodalovunarim.pdfIn PDF document text
    • http://baffer-shop.space/how_do_i_upload_a_picture_to_google_to_searchjznls.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/sobajedosuruf_jaxokuk_jadekelalemi_darosekel.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/7492013.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/6435713.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/ba9c834b-4a53-4290-a594-fedf2a167f45/winujupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ead8de-99dc-4732-b871-e0c2b606e640/maduvavuripami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc98ca4-0f85-4a30-ad22-c9b2dee9b252/48311011980.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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 5372 bytes
SHA-256: 51e44c63d33a30ea359e5cb5bb297f4ea590555f51ec8c9f313e86e7727179a5
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 12744 bytes
SHA-256: 173f3ef516f31279c7086f320dd4510f3d4c70629c84ea029f9d7b3c1de19def