Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce949a3cf3745a8…

MALICIOUS

PDF

72.3 KB Created: 2021-03-21 07:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 04a82b878c5eb901fc650053d8612bde SHA-1: 4727ca57adf4dc0bce0432b6ff7c327e889ffa69 SHA-256: 1ce949a3cf3745a8cf267e936c7d1d92f5fd584ae66ec021a166685ef731ac31
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting and redirectors, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=double+replacement+practice+reactions+worksheet+answers In PDF document text
    • https://senajadodum.weebly.com/uploads/1/3/1/3/131379015/6737969.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/WJRhbia/dabizugefo.pdfIn PDF document text
    • http://podarokinsta.site/can_i_still_download_sketchup_for_freejtwe8.pdfIn PDF document text
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/viver.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/hichjEi/2760561924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_601609953bce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_601e1f32d6264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_600a88cae631d.pdfIn PDF document text
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/borekile.pdfIn PDF document text
    • http://tixshopclub.space/what_jobs_can_i_get_with_an_mba_in_international_businessiqsu3.pdfIn PDF document text
    • http://vizit.store/kujajibisiburolofezuduserpn1ky.pdfIn PDF document text
    • http://namelesssouth.xyz/56910861908parr6.pdfIn PDF document text
    • https://cdn.sqhk.co/jakofawesavo/3gjiFke/nuvulowa.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/PM1t2gg/kijekalukerowozarimuzawo.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/44061877025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_60275ba62c8e8.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/f34e98734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_604b1239d7cb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_94c99607dbc54205b216e6f1c07644b3.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_4d4246a84b5845a8a6415a69b117ca36.pdf?index=trueIn PDF document text
    • http://boxijekew.atwebpages.com/ielts_reading_passage_sample.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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 5468 bytes
SHA-256: 2f30f99ec576012f46288564bcba502fdcff80199dc76ec416631ed4de5a3e1e
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 10652 bytes
SHA-256: 9057d3be4c3d0ddf923c73c528821639614e335451cd451c5af3519cfcceeaba