Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f6a79ebcd1248f…

MALICIOUS

PDF

84.6 KB Created: 2021-03-22 02:29:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b5bdaaad1deb137f7dc26a9271cbc4d3 SHA-1: 10d7ec9637877388e234eaa157ce5dd241f484a3 SHA-256: 38f6a79ebcd1248f226335912e08ac1102c57075ec59ed881f829a5a83ec1662
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, 'https://soxebez.ru/award?keyword=concrete+mix+ratio+calculator+pdf', indicates a potential lure for users searching for specific information. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, possibly to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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/award?keyword=concrete+mix+ratio+calculator+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472776/normal_60342c80c499c.pdfIn PDF document text
    • https://naxigekaserudo.weebly.com/uploads/1/3/4/6/134644932/6cb411f5a789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_602e08b9e923d.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/arturia_keystep_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489601/normal_6041ec24d7491.pdfIn PDF document text
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/df89158056587.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/gokiziv.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/niramepozi-baxetixa.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/xubojesa.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/bojaxudotebabilisot.pdfIn PDF document text
    • http://8bitbeardsco.com/5760394790831g5n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6052ff76ab6ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_6024a167538ee.pdfIn PDF document text
    • http://pokupka.space/xilubare6lehm.pdfIn PDF document text
    • http://bestunew.xyz/munaledunm8jyd.pdfIn PDF document text
    • http://contact-git.top/66460640130gfl8k.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/somidolivubizepalinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/torelowuti.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/98669463908.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/beckman_coulter_access_2_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/lejaxitebevadulirofasix.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_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 5096 bytes
SHA-256: 6a6ef955acb8eb2e7f777014472d33977659c609c6eade011b1fad23d8e2a0ff
font_01_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 11808 bytes
SHA-256: 3880c251e9d04b6e26ed0ec5462d5a0ff3ef3b57753c76f687b0f2da5c170cf1