Malicious PDF — malware analysis report

Static analysis result for SHA-256 20631efb13f3d7a1…

MALICIOUS

PDF

100.3 KB Created: 2021-03-20 14:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0c15f81f80acb6ab99a1db65e399a9da SHA-1: db327237ca77e2c94f54d09b79543612bec8502e SHA-256: 20631efb13f3d7a1328257508d82f246edd19419312794e4166bc9aca2f9b475
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or host phishing content. The presence of embedded URLs further supports this, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/wix?keyword=wave+mechanical+model+of+the+atom+incorporates PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454558/normal_5ff4b69a08324.pdfIn PDF document text
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/sisezi.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/xenaduferivalad.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/2867948.pdfIn PDF document text
    • http://nigasheff.xyz/juxitase1tog8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_600bcad70ac2d.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/domefo_wokado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fcbf8e9cca8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ff75596ab611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5feeeececba8b.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/anarchy_in_international_relations.pdfIn PDF document text
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/fuwezowavekimiruzina.pdfIn PDF document text
    • http://tehnikator.ru/twitch_android_black_screennrnv0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374521/normal_5ff381851c591.pdfIn PDF document text
    • http://complerbnp.com/xubumalikapodajovojepibes6zt5z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5feb1ab293d2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutejaxevewef.myartsonline.com/dekaperon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5510b52-ba0b-47bc-a360-1662bb39f76f/72232083103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a286ff32-ed62-44d1-b29e-e0a359707c44/jivulubesikopogideluxebor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8989f06-1624-4af6-8685-5f15341f4090/67761378922.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/pifemiris.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_off000142c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C5 5468 bytes
SHA-256: 3d18869460d5092ead1ef8c35c16cd84e556976d837b235ca468ab278d6f333f
font_01_sfnt_off00015545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15545 13028 bytes
SHA-256: 462f7cf965247888563771aa7d1fd45e82205e106e5af6eeb1ccc7fb3d92288e

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