Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf5d7e4294a8a6e…

MALICIOUS

PDF

111.9 KB Created: 2021-02-23 20:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d637b4071d4e7e01203cc7765cc5aa0c SHA-1: 7ad399c0c197dfc2560e4c6211e42d6fc5c12c5a SHA-256: 2bf5d7e4294a8a6ee998dde1fead2fdd16635e87af399e4aac62bb47b1c15dad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to direct users to malicious or SEO-spam content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=what+does+helter+skelter+mean PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff3374629a90.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/3543222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487641/normal_5fe3dc15b7914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5fd844e0ce376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405409/normal_5ff9499b3bd80.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/9040375.pdfIn PDF document text
    • https://barosowuni.weebly.com/uploads/1/3/1/3/131398377/panobu-galodikujudub-xifami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459776/normal_5ff48fd56836e.pdfIn PDF document text
    • https://zesoxomilojul.weebly.com/uploads/1/3/4/0/134018604/9155423.pdfIn PDF document text
    • https://gijedilegin.weebly.com/uploads/1/3/1/3/131380969/1920255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fe4541a9ff97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371523/normal_5fd06fe03b080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_5fe84e58e6f63.pdfIn PDF document text
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/bakoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_600827732bd29.pdfIn PDF document text
    • https://xawawamofolapus.weebly.com/uploads/1/3/1/4/131436997/5bc5fcefb6b.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/potamotaz/86920751287.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/oxidative_phosphorylation_biochemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/byju_s_hack_apk.pdfIn PDF document text
    • http://mapulikilep.epizy.com/apple_support_mac_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/82968421848.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_off00017acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACC 5144 bytes
SHA-256: e08b96b4163e70ee4c5de3715a7ad40d31c49e0a3473249c6bf475a5d1b9fc28
font_01_sfnt_off00018c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C27 11008 bytes
SHA-256: 95507ce4c17843d66220220a2271d4776fee9749d07aff7bddd6c2379d745126

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