Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d907e0491a1c15…

MALICIOUS

PDF

84.1 KB Created: 2021-01-29 04:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7d7fbe9cca65b873966b7a6f79243dc7 SHA-1: 2292ee9503a6c1cf7576eb6481c4d2c07103ce18 SHA-256: 37d907e0491a1c158918e3bd5b53196ec4577370889d28d5692183fe025c124e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://bologen.ru/123?utm_term=soclean+2+instructions+for+resmed+airsense+10 PDF link annotation
    • https://kukavijeri.weebly.com/uploads/1/3/3/9/133997324/jofetajuke_putanit_vinozoravoj_wazudiwujasugex.pdfIn PDF document text
    • http://spoonnumberone.xyz/zulexafakidelunoji0bjv.pdfIn PDF document text
    • http://dorightpress.com/75388733324ddhsv.pdfIn PDF document text
    • https://panonalosisewe.weebly.com/uploads/1/3/5/3/135316392/dd36173.pdfIn PDF document text
    • http://heartcenteredequestrian.com/boninezivilojasapuwiz8ir09.pdfIn PDF document text
    • http://raicen.com/sivatalagos3qu0.pdfIn PDF document text
    • https://pewepexit.weebly.com/uploads/1/3/4/6/134659954/kelomig-dijunetogeku.pdfIn PDF document text
    • http://wisitens.online/mulitabilazenizipofuwotq7jyl.pdfIn PDF document text
    • https://lowaribopuvege.weebly.com/uploads/1/3/2/8/132814272/duwupolulide-najuget-ripiwa-xilezadub.pdfIn PDF document text
    • http://4kuhd.me/dategirewuripajosi13i9h.pdfIn PDF document text
    • https://duxuxapuxud.weebly.com/uploads/1/3/5/3/135332588/2438645.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/0c8c00c.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/wovirupogoxomido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tubujaj.epizy.com/voseg.pdfIn PDF document text
    • http://luzutajezilako.rf.gd/gokipalug.pdfIn PDF document text
    • http://zinizebaki.epizy.com/net_regex_cheat_sheet.pdfIn PDF document text
    • http://jegozejixal.epizy.com/hoodoo_ski_area_snow_report.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 5596 bytes
SHA-256: acb8913949690df7c97b6c10126060aaa51aee735f06f91f92aa6046fe92956f
font_01_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 11372 bytes
SHA-256: 470e7c4c5cf4d3e9344afcaa80bfe14336579c296e03fd3cfcc3d396b5073eb5

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