Malicious PDF — malware analysis report

Static analysis result for SHA-256 504a6c3071cf20e1…

MALICIOUS

PDF

75.2 KB Created: 2021-01-12 11:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bcdbd233bed54ac7bb26eeae41f97a60 SHA-1: 305ce944c5fefd58b18379106fc8e27b4f0ff453 SHA-256: 504a6c3071cf20e1c11b37e02d933be4e729d7b7ce7c18bc09f52beac47460c5
214 Risk Score

Malware Insights

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

This PDF file contains multiple embedded URLs pointing to known malicious redirector infrastructure and a large number of external PDF links, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ggtraff.ru/123?utm_term=wow+macro+focus+tank+target In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5f9a8e05af601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415962/normal_5fe58af16a78e.pdfIn PDF document text
    • https://site-1178403.mozfiles.com/files/1178403/zerafozifaxakezogudosili.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jci07gd/69773106757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_5fb7ac93d48e4.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/tuzuxobed_kanifukilutud.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/05Wme5p/62449948005.pdfIn PDF document text
    • https://cdn.sqhk.co/rolekixawute/t6iijdL/pop_slots_free_chips.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374696/normal_5fcb8dd661e0f.pdfIn PDF document text
    • https://cdn.sqhk.co/soxoxefumuv/Uhftigj/have_big_wingspan.pdfIn PDF document text
    • https://site-1178351.mozfiles.com/files/1178351/84993230138.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/NTMigjb/jawanuxomipepadusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5fdd9231a624a.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/WOkpEnG/age_of_ottoman_mod_apk.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
    • 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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 5172 bytes
SHA-256: fd4e90326e9faec66d7367ddbb9b4f253acd8f0ad72fa18a99835c39c7c2103e
font_01_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 11060 bytes
SHA-256: 498572ce8f7064bbf90ddf8fa533b9e43b2fe2bba3c84afb044bc8315f15c73a
font_02_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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