Malicious PDF — malware analysis report

Static analysis result for SHA-256 49aac7b687616e27…

MALICIOUS

PDF

91.7 KB Created: 2021-03-29 04:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a6e629f6acfc43c22389fa388ab82b9 SHA-1: 7868e0dd4fbdb29063be3f7e5dc0e6d60c3bb428 SHA-256: 49aac7b687616e27b5d6933ed95cec13d2a392f94691c625395c242f27b40aa5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=char+griller+charcoal+grill+reviews
    • https://cdn-cms.f-static.net/uploads/4452173/normal_605b7afc1634a.pdf
    • http://nigma24invest.online/60055385676615r7.pdf
    • http://easterthjg.com/tejegilajemojokiboderara51y2q.pdf
    • https://cdn-cms.f-static.net/uploads/4421215/normal_605d9ec8c09f7.pdf
    • http://jubigale.scienceontheweb.net/visavibagusidutopawage.pdf
    • http://zespodsvetkoy.site/global_citizen_concert_2020_nyc4hful.pdf
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5ffbf1f4803f9.pdf
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/b7b54ec.pdf
    • http://gebevojika.mygamesonline.org/wopafi.pdf
    • https://redutoxaxijarow.weebly.com/uploads/1/3/4/7/134760413/zorazetixoru.pdf
    • https://static.s123-cdn-static.com/uploads/4452865/normal_5fc623edc551d.pdf
    • https://static.s123-cdn-static.com/uploads/4426080/normal_5ff4b7fb2c49c.pdf
    • http://afracheat4.xyz/93230889583kft6a.pdf
    • https://cdn-cms.f-static.net/uploads/4372707/normal_6041946102d84.pdf
    • https://cdn-cms.f-static.net/uploads/4422161/normal_60215e13e7f98.pdf
    • http://pojokup.getenjoyment.net/cash_flow_example.pdf
    • https://cdn-cms.f-static.net/uploads/4481154/normal_604b0ea564525.pdf
    • https://cdn-cms.f-static.net/uploads/4366993/normal_600d004beaa63.pdf
    • http://help-bluebadgecustomer.com/fanatic_armor_niohs34rh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jupuluna.epizy.com/world_economic_forum_reports_upsc.pdf
    • http://nexisaxilesa.rf.gd/64739473449.pdf
    • http://melukibojenubud.rf.gd/hunchback_of_notre_dame_name_pronunciation.pdf
    • http://tamedigozetot.epizy.com/foxazixavajusosakinigijo.pdf
    • http://zawanaxakav.epizy.com/reduce_size_macbook_pro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012952.bin
d9d90d2b4e7306913f512d3bb38092b86076f99ae42504f24fc4a22e900bc447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12952 5120 bytes
font_01_sfnt_off00013aca.bin
68fd70deea9ba6f6e26a78c732ed12eeb156161074fba5990be71cd5cc8fbd56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 10836 bytes

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