Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1741b040ae5113…

MALICIOUS

PDF

83.5 KB Created: 2021-04-04 22:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe729c17297456b4d6159b64ac3ea368 SHA-1: 2edc49bd328389e7032ea669759ab1c935418ca6 SHA-256: bf1741b040ae5113233ca9e004065498e362fa02a90ab6ab8c9c3c46e9cf8bbd
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a PDF link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=android+tv+remote+control+pc
    • https://cdn.sqhk.co/kulukopupiw/fiemms0/chocolate_and_marshmallow_cornflake_cakes.pdf
    • https://cdn.sqhk.co/jagapifa/U6ijhcI/38786111968.pdf
    • http://iminn.ru/ibm_rational_doors_9._6_user_manual64z59.pdf
    • https://cdn.sqhk.co/reretukida/iagcAgd/metal_slug_anthology_pc_portable.pdf
    • http://ewop.space/black_and_decker_20v_lithium_battery_trimmersl0mg.pdf
    • https://cdn.sqhk.co/zowolanazew/gflhhhg/funny_quotes_for_whatsapp_status_in_english.pdf
    • http://lnstagramsupportingcenter.com/medodimubatatipidupox4bc68.pdf
    • http://natorg.fun/tadejigow6fbu.pdf
    • https://cdn.sqhk.co/tegimatararo/Tv1Zjl7/7758061969.pdf
    • https://cdn.sqhk.co/dekaroku/Zt82Lib/64935305645.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/julaxel/girudesadifosudadanog.pdf
    • https://s3.amazonaws.com/mubefula/magic_8_ball_answers_no.pdf
    • https://s3.amazonaws.com/varolexexus/how_to_connect_my_ilive_sound_bar.pdf
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_3f2cc0b34d164be18c71979d0b750ccd.pdf?index=true
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_9acbff6098a748df94a81102e6b34ffb.pdf?index=true
    • https://s3.amazonaws.com/rumezo/mailjet_api_template.pdf
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_037ef2bc075d431fba9380539d24341b.pdf?index=true
    • https://s3.amazonaws.com/dugibabafod/kufogitimusidusega.pdf
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_6b99751a41754a6cb072788b24410af3.pdf?index=true
    • https://s3.amazonaws.com/bamepofewalada/pujipizemuvika.pdf
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_1680a352d85a469c8e6895e202813aa4.pdf?index=true
    • https://s3.amazonaws.com/lovomijelun/xidube.pdf
    • https://s3.amazonaws.com/wixatax/47842077930.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ba8.bin
30a1f8d39dc1b84c4d748a05df71da97a722789403e9c9a009dc7e958a004448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 4880 bytes
font_01_sfnt_off00011c2e.bin
babc3409f23b4bf46092aecc7962f1faf863eae179662a4d79e5d5a7a49d3d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 10752 bytes

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