Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe572f30f48a154b…

MALICIOUS

PDF

69.3 KB Created: 2021-02-10 17:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2e5f8ceea7764b3e5eb4861194cef3f4 SHA-1: 722f8917f881ec4651009a8c7fdf69e99d15bb53 SHA-256: fe572f30f48a154b57c97a782841b3096ac7da49e1d6d32e36f5ff9d3ab51857
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with many pointing to disposable hosting and redirector infrastructure, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing trojan. While no scripts were directly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to 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
  • 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/123?utm_term=how+to+use+a+herf+a+dor+by+humi+care In PDF document text
    • https://cdn.sqhk.co/nenakowi/hcjcSdL/plants_vs_zombies_2_monsters.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/nN2hcs5/rankedin_sm_squash.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/figuwumajabib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5ff422eaabe50.pdfIn PDF document text
    • https://tupuzosajabol.weebly.com/uploads/1/3/2/6/132695591/jetabi.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/bgdhfja/49448546659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392191/normal_5ff2af92986c1.pdfIn PDF document text
    • https://zozutogumudeke.weebly.com/uploads/1/3/4/4/134440166/komeranovevaxatozuj.pdfIn PDF document text
    • https://situtewazugigev.weebly.com/uploads/1/3/4/2/134265876/866ce90.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/sadikiwaxad_pemibojapuden_piropex_burirefevuj.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/2707635.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/gajabedafot/xonifipamuvoletigasid.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/4805680094.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/45010754377.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/spreadsheet_javascript_free.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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 5524 bytes
SHA-256: 1ea2d4ae39ee28035f36e929168b8edefaf8c8c49d740753965ac4bd740ddaa3
font_01_sfnt_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 10972 bytes
SHA-256: 6759c780816d4e25992ab67110690863931bdd760e827e3cc0dd1b040655a825

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