Malicious PDF — malware analysis report

Static analysis result for SHA-256 048c21443f2442f4…

MALICIOUS

PDF

76.3 KB Created: 2021-02-28 00:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: af4d6676d5a8af0057ec758dbfecc458 SHA-1: 262a1b9269fd490c9edffdd8b7c603db98264e1c SHA-256: 048c21443f2442f4039fcb4f4cd5a1c5cbb2f6441f83d45368e0c366033ae550
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=2002+ford+explorer+xlt+transmission+type PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376854/normal_602f3243eb07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_60221b019af67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_5fe41cf0d7b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_6019d5df012ed.pdfIn PDF document text
    • https://wibosopepizasu.weebly.com/uploads/1/3/4/3/134332643/nopapoxugefukaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5fd3cc291f4dc.pdfIn PDF document text
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/5666948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_602eec913027a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fd6145e21aa5.pdfIn PDF document text
    • https://jarufepijup.weebly.com/uploads/1/3/0/7/130776730/xopobisutizukab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_603a49dbc4b57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_600453c4a68c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_6025f9c826bd3.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/lanorolowu/61575301856.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/beats_wireless_speakers_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/72830947095.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/rpg_maker_mv_heroine_character_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/cns_lymphoma_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/duraflame_electric_fireplace_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/lagu_change_up_seventeen.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_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 5536 bytes
SHA-256: ad805b8961644ce8b3a18a4b6c80c4b29cba323991f5b3f614ea6e2dcc283f59
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 10700 bytes
SHA-256: 31f37dd734072dd3383f175fc6b4509c2ed6d4410c4b2759c2eb739ec0c25226

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