Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e8821152b81468…

MALICIOUS

PDF

74.3 KB Created: 2021-02-08 08:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a1cb506853384782bc26862f1b673ecd SHA-1: b370703e96f7ee9a736b02e3bf799b417d094c06 SHA-256: a2e8821152b8146891b7a4209f235f9d853194ebedddab3b14cc175c3ce33f2b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic. One of the primary links points to a URL that appears to be part of a link farm, potentially for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier also strongly indicate maliciousness, likely related to phishing or trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=bootstrap+template+in+w3schools PDF link annotation
    • https://cdn.sqhk.co/vinasujitupe/ikmXBtG/life_simulator_mod_apk_android_1.pdfIn PDF document text
    • https://xulazipilo.weebly.com/uploads/1/3/5/9/135958699/34a6e172c1acfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5fdc375724624.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/igCRahc/bike_sticker_for_whatsapp_web.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/woxalojurivir.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/Yjfl7JO/58510475468.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/hjgiihc/18269182628.pdfIn PDF document text
    • https://balawuwugo.weebly.com/uploads/1/3/4/6/134622143/c5aa467.pdfIn PDF document text
    • https://xijegasafofid.weebly.com/uploads/1/3/0/8/130815381/5751105.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/gogunabones/airbus_a320_prepar3d_v4.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/vande_mataram_indian_national_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/roliw.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/xogotunopamutalinezabuvuz.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/90962446809.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/anhalteweg_berechnen_physik_formel.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/98060613327.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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 5480 bytes
SHA-256: cfb01ffb74c2471330be97dd6e8470687a75bb462ba739e0ed208ca3b70c6c33
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 13212 bytes
SHA-256: 5f84465ce6dc593a68bc0696f0a1f4cb229f39f02da502a49d9f7e6be9c4265a

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