Malicious PDF — malware analysis report

Static analysis result for SHA-256 d678d8e859dd462d…

MALICIOUS

PDF

79.3 KB Created: 2021-02-20 14:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1806a298e3ef4fae4425c69fbbbc8e9a SHA-1: 1fe767a8cdcb5000edf35fe45aa1bbdea3df5de8 SHA-256: d678d8e859dd462d4165ab4d7c493d5bd1bb0451f5bd016eb00319db78c4e9d5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting or suspicious domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the PDF structure itself are consistent with techniques used to manipulate search engine results or lure users to malicious sites.

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://jacksth.ru/wix?keyword=jh+news+guide+jobs PDF link annotation
    • https://jasemoluzisad.weebly.com/uploads/1/3/5/9/135968146/6794760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_602e54ebb9144.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/igjm9hb/58080816546.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/h3GghOo/mobile_patrol_public_safety_app_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450630/normal_5ffda6c9a4516.pdfIn PDF document text
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/85a2d.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/2QWhchi/piviseboxejidalukezotizo.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/fieWMjj/figolonaja.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/gjesjic/winking_lizard_independence_beer_menu.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/9711384.pdfIn PDF document text
    • https://waferipesor.weebly.com/uploads/1/3/5/3/135307907/51e2a487b57e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/arjun_reddy_bullet_bike_ringtone.pdfIn PDF document text
    • http://roritobefeda.rf.gd/cisco_ise_2._2.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/padoneput.pdfIn PDF document text
    • http://zijodere.rf.gd/holy_cross_choir_calvary.pdfIn PDF document text
    • http://rifovedukuj.epizy.com/33520271734.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/72745120214.pdfIn PDF document text
    • http://jamigiboweb.rf.gd/timeline_template.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_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 5044 bytes
SHA-256: 2dfbce9eb29dfdfa5c4c12306a0d4d2a7fb4e41bdfdd5f0ae98790b45822b6dc
font_01_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 10932 bytes
SHA-256: 0766f7c14646a190d8ec64fda2fbd9365aae2ac8b0c3cbda892b2151d330d1d4

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