Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4ac26388441438…

MALICIOUS

PDF

78.8 KB Created: 2020-12-30 19:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f3e5e77a3dae93e093ecca25cdd51530 SHA-1: b1ba3829a9b7f964d3c967627e56c1cad7180aa2 SHA-256: dc4ac263884414384a212cb56a3c549a695fb31e1eb6c240f23d075d9ee3ced5
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the link farm structure are indicative of a phishing or malware distribution campaign.

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://traffmen.ru/strik?utm_term=fitbit+versa+3+vs+versa+2 In PDF document text
    • https://nopefulewipedu.weebly.com/uploads/1/3/4/3/134314682/a0f53f5109e.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/f69a4253b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_5fada50c366da.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/ja7JgjD/mezakitajozofujuribi.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/gdhfNgh/nopuwefuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5f973644cd72a.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/iaxihbc/nisaxuvanunalajifapi.pdfIn PDF document text
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/7276902.pdfIn PDF document text
    • https://kunobile.weebly.com/uploads/1/3/4/5/134517695/e381d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5f955a28374ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5fad8b29c37d4.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/gjiidhh/27113718951.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/nubagakotamuxokali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5fa5e9bd149e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0859fc2d-81ae-4ec3-b681-6d098db0dd10/samsung_sgh_t399_firmware_download.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_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 5096 bytes
SHA-256: 461ad2615e7735c7d69c729056c0bf431ee8ee3f736e7396627983c9a5ac5901
font_01_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 10660 bytes
SHA-256: b559a4d6470d0e6d0fe434ae608f1238d335dead6879032d757c1cec6e08eb9d

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