Malicious PDF — malware analysis report

Static analysis result for SHA-256 760727ef9a4297e1…

MALICIOUS

PDF

80.8 KB Created: 2021-02-25 06:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2282e36e7eab107f569f29bfde6d8a93 SHA-1: 6aef85d5f68544e2381e9417b4fdabb8a22e83aa SHA-256: 760727ef9a4297e1499f796e26584c6ab32f449341b0b2be87b64e3f513fd50a
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, and one critical link to a known malicious redirector. This indicates a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=cognitive+psychology+professor+jobs In PDF document text
    • https://cdn.sqhk.co/fijumirana/ickFhdc/74145429508.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/ijgheie/90181730046.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/bujop.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/oVji6jh/73261219136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5fe8e4132d62d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fd7d98fac5cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fe106dcc3fe4.pdfIn PDF document text
    • https://cdn.sqhk.co/kabolode/hhfijig/45696782669.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/FiiHieA/gimp_sharpen_image_after_resize.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408709/normal_600573bd745d4.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/vebumisakonasavodu.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/Iha7egh/47114099216.pdfIn PDF document text
    • http://cozyplacefor.rest/2006_honda_civic_ex_coupe_service_manual9e79v.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/1894895.pdfIn PDF document text
    • http://50offshop.pro/nitecore_i4_reset0r4zq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mesotodimus/amazon_mws_order_report.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/challenges_of_implementing_integrated_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/73817584907.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/xadunobogijebituretime.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 5256 bytes
SHA-256: 9da87bd5b5e724fb1d9b58b6c68e8e4996c369b52d8322c71431410a7581ead4
font_01_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 11364 bytes
SHA-256: 01b9088bd7aced5f7e941b3719a222f40b88a01e6bd20c65e4a81876ca3160f2
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e