Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce86851a9fb550f…

MALICIOUS

PDF

80.8 KB Created: 2021-02-23 10:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bc4e057c24391cc365c0fd78630680fd SHA-1: f1091ef3de7e9629ecfceabd9efe08ee3f4811c8 SHA-256: fce86851a9fb550fa0f8374bc70998d899f9f8c5e31757d6059265b6deabc575
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded external links, many hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to phishing sites or potentially download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=cs+1.6+cd+key+oyunsunucum PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5fe44a7a40246.pdfIn PDF document text
    • https://dafepigog.weebly.com/uploads/1/3/4/6/134605944/e1011ab6a19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481161/normal_5fe18236b7e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_601290e23489c.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/2RjddNM/jitazumipumorupumulo.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/dolozutamasodotuwaf.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/3897951.pdfIn PDF document text
    • http://tasefuvakol.22web.org/sol_marksheet_ba_programme.pdfIn PDF document text
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/dobafubekuzimosop.pdfIn PDF document text
    • https://tadeliganunuzax.weebly.com/uploads/1/3/0/9/130969808/c5a87a794e26.pdfIn PDF document text
    • http://zelegurelo.iblogger.org/54590079546.pdfIn PDF document text
    • https://vamepuruzaf.weebly.com/uploads/1/3/4/3/134352512/birazalojal_fifezotose_sijesawewe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414357/normal_60075598cbd86.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/9569629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_5fd9418d8a523.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/warojadawunumok_gusivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://kopuperoki.epizy.com/simple_job_application_letter_format.pdfIn PDF document text
    • http://jenigaseze.epizy.com/86105654720.pdfIn PDF document text
    • http://putojoner.rf.gd/55819541086.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 5056 bytes
SHA-256: 588b1d5e2019316396b5f51a26af6b4467f7edc332e38582c6d6480d2db66fe4
font_01_sfnt_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 5800 bytes
SHA-256: a27be0c2a00f9c6c49f9d02bebef1b52549148e5038c4b85885353a9944a0566
font_02_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 13456 bytes
SHA-256: 9f5276e814548d5511cbd71c2d0600cecc7639331064f4ce356ca60098e0ec05
font_03_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 16028 bytes
SHA-256: 0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8