Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8fdfeb3ec048c9…

MALICIOUS

PDF

80.3 KB Created: 2021-02-25 00:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b57352e79dc6aaa8912b5f9f8173b824 SHA-1: e2194ac5b462662341dcbdac93d282271fdc3d69 SHA-256: 3c8fdfeb3ec048c9e2c3ad09b1ff08542bb2c12b2ced46a19c187e2a015a626a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of such links, suggesting an attempt to drive traffic to malicious sites. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely used as a lure for users to click on embedded URLs leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=construction+cost+handbook+philippines+2016 PDF link annotation
    • http://reduslimitalia-oficial.site/venovatawimuxodiwixezz2wvc.pdfIn PDF document text
    • http://swiss-gear-top.xyz/92745903666venlr.pdfIn PDF document text
    • http://bbcua.site/415695939358mhgo.pdfIn PDF document text
    • https://dukagalirizaz.weebly.com/uploads/1/3/1/8/131856141/noxufukanufexuz.pdfIn PDF document text
    • https://wuwogijate.weebly.com/uploads/1/3/4/8/134886767/tilap.pdfIn PDF document text
    • http://albl.ru/mezoxesarh03n.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/baposivarabuj/63665905010.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/59550110988.pdfIn PDF document text
    • http://marabawem.rf.gd/different_biomes.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/meenkulathi_bhagavathi_amman_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/milwaukee_voltage_detector_2202-_20_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/2335975574.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/selfie_bearbeitungs_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/razufomerodinesos.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_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 5748 bytes
SHA-256: 3836a296813ab3cb57cad305629b58816f12a2a05b84cbfb4639dba613bb1278
font_01_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 11948 bytes
SHA-256: d897880153e5b4956a2a28c1eb4657fadb791d826475e09ccbdd27506dfd721b

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