Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b88f1678b97ec7f…

MALICIOUS

PDF

78.1 KB Created: 2021-06-07 01:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 57f30b31dbe55a45e4b135a42b1c838d SHA-1: ed7e04e62297078b0791698953fcc89a51f68e61 SHA-256: 9b88f1678b97ec7fdace8dc635af4bd0f4035685cdef20831a58bffd4bb9a73a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or ad fraud. Although no scripts were explicitly extracted, the presence of numerous external URIs points to an attempt to lead the user away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/123?utm_term=shopping+in+spanish+worksheets PDF link annotation
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/momegopu_suxusatosebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_605b7764d4ab6.pdfIn PDF document text
    • https://xowimigijik.weebly.com/uploads/1/3/1/6/131637135/a576a0cb1a37472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_604f3b423212b.pdfIn PDF document text
    • https://zigulowowe.weebly.com/uploads/1/3/1/3/131380415/loxupisaxotav_tabarutel_nizolirowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_601f5fb23677b.pdfIn PDF document text
    • https://poxanada.weebly.com/uploads/1/3/1/4/131483305/mopemep.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/nizamel-zetirap-votunusu-peritipidero.pdfIn PDF document text
    • https://feruzizujuvete.weebly.com/uploads/1/3/0/7/130775768/vuzonebukub.pdfIn PDF document text
    • https://rijujofa.weebly.com/uploads/1/3/4/3/134323569/pinizemirivofum-kakitegofu-zuwokid-mixemomat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fec2f031a794.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4451954/normal_60b0b3b86a8fb.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/fc7c3db30.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/1204014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_60315759ddc14.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4424007/normal_60b3b8900d13a.pdfIn PDF document text
    • https://lisofagan.weebly.com/uploads/1/3/4/5/134598873/naravefilored.pdfIn PDF document text
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/8c26dd41d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_605706689ca5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_603d37a78a84d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 5308 bytes
SHA-256: 42cd17fb1624ce3bf7320756a98487be975ea9f1768d017a67f5a5806afe4c60
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 11588 bytes
SHA-256: 4fb7c1cdddb4b22f9688c8737a77adbf57f2425cd4612f688883d254b1ca76da