Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dee55f7a09d370…

MALICIOUS

PDF

84.7 KB Created: 2021-03-06 12:35:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dee60c6551a4a840ac8b675afc90e032 SHA-1: 56f975105485f26aaf3df871459140e0cde7e236 SHA-256: 44dee55f7a09d370fa14d1eb736dc09fb141375a312c37b0efd0726a735b0188
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=how+to+write+a+central+idea+essay PDF link annotation
    • https://maladebo.weebly.com/uploads/1/3/4/3/134305387/nimizobeto.pdfIn PDF document text
    • https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/posodurefagorazetev.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/SmifseY/71531222031.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/bobcat_s650_code_m6803.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/bFgfTic/lezememojesiruvonalowunip.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/what_does_pyramid_head_represent_in_silent_hill.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/12224065640.pdfIn PDF document text
    • https://pusexijubod.weebly.com/uploads/1/3/5/2/135296384/dulugulufimatitu.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/is_calcium_bromide_acidic_or_basic.pdfIn PDF document text
    • https://cdn.sqhk.co/rovovuroj/cOdgdzC/8496498185.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/hkSzZ3B/shark_world_game_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noroved.myartsonline.com/napowodetoribiri.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/72000384259.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/tuzirasatuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/notedoxenobeginesak.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/nifaduz.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/relemuximomodujefazekiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/how_to_control_metabolic_acidosis.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/11517313059.pdfIn PDF document text
    • http://lifobem.myartsonline.com/86921211332.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_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 5088 bytes
SHA-256: cd66476eeb93e24516d5cea096a597fac076160efc94e5166f1a11348f1cac12
font_01_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 10364 bytes
SHA-256: 5bd821e3c568c117d9d2f3f746557714448e91f5743280f5f3faed6ffef55034

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