Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2631d0936849651…

MALICIOUS

PDF

73.4 KB Created: 2021-02-28 23:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 46630b5e90719a6e3b57a32f734e92ba SHA-1: f135880183110e764f8935c47a3bb6a6c8fb9758 SHA-256: d2631d09368496510656470387e9cab46bd2a99f915800bda393e7cd107623c9
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous URLs pointing to potentially malicious content supports the classification as a phishing or malicious link distribution 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://jacksth.ru/award?keyword=insinkerator+hot+water+dispenser+faucet+only PDF link annotation
    • https://cdn.sqhk.co/bodapumof/gd0geja/big_knife_pictures.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_603743dc5a55b.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/mGq7oje/56856749427.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/g7IZyae/pay_express_toll_route_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/KNCPDia/devevujepagabil.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/tosupejibagipin-lidof-sajogizaxatawo-viluge.pdfIn PDF document text
    • https://lelunoforonu.weebly.com/uploads/1/3/1/6/131606056/1588468.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/hgcCBik/heart_health_tips_for_seniors.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/xeroxupigogiroborat.pdfIn PDF document text
    • https://tabureribe.weebly.com/uploads/1/3/0/8/130813037/dumipepadiwavum-kefumizen-werewasabuki.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/jitokox.pdfIn PDF document text
    • http://tehnopolis.org/eisberg_fisica_modernacpbt3.pdfIn PDF document text
    • http://optamorem.com/garmin_52_with_traffic_reviewsdypx3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toramowajo.epizy.com/80703349658.pdfIn PDF document text
    • http://senegowafev.epizy.com/37516855759.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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 5440 bytes
SHA-256: 3708a9cc618c3d2a21f4b5c973135d33a8f939d3e1363b337108bedf9b750662
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 10444 bytes
SHA-256: 1cf19dcda74dc0dbbf9d0891a3c5434f852e99a703ed8d003daece8c496186cb