Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbddbb2033667ce…

MALICIOUS

PDF

82.0 KB Created: 2021-04-23 10:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 84dd5638115efd87a576b9772abe25d2 SHA-1: 9713a27229049d7ad117fc59eee6ca7d1cb4c455 SHA-256: 1fbddbb2033667ce1a9a08660c955b26b687e61c7b2a4804ca81a385cd7be3f0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://nipisod.ru/strik?utm_term=the+human+condition+jon+bellion+mp3+download', appears to be a lure for downloading MP3 files, which is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=the+human+condition+jon+bellion+mp3+download PDF link annotation
    • http://wide-take.top/68478461553pbw2n.pdfIn PDF document text
    • http://stroiline74.ru/catch_platform_means_whatnblih.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/heZTdSC/polisakurarekolidok.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/vHhjgjv/guravokepupawi.pdfIn PDF document text
    • http://study-english-04.space/la_verdad_sobre_el_caso_savolta_onli5m4tg.pdfIn PDF document text
    • https://cdn.sqhk.co/xezexasag/ahjEfja/milling_feed_force_calculation.pdfIn PDF document text
    • http://tohld.in/15344904884npcli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_d8bcc9877eab47ab97e4e9cc5e70da85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/abrasive_formation_in_drilling.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_19fd889e009f434f9ceedfafda43bbaf.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_a87c92072d984106b6d9322a68755b7f.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_8f8d1f68a38d4185a1797eece04bfc41.pdf?index=trueIn PDF document text
    • https://6dca1d0c-b102-4aa4-a312-d013f97c39dd.filesusr.com/ugd/fb87fb_7010715f77024104934f541f71a74168.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_0118f12abc2b4905ac57a4ba0fc59330.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/icici_lombard_annual_report_2019.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_ac90d040a1004a22be90ba184755d924.pdf?index=trueIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_1f462801fe3c4832b47b97c33ffa7cf1.pdf?index=trueIn PDF document text
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_50a1d366973d44c395260e1724665d1b.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_22f75609b490434da4ef93c6a777e32e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/80818889623.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_a191fb3e907644ad8e907defb39e08d4.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 5460 bytes
SHA-256: d2c03b40e44cfaff02e88e270e385cbbdc1deabb4ff604ef4d804b07e8588a00
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 10988 bytes
SHA-256: 77a8b68ee7ab2e1e215f5906efefd86fa61e9364c09bc869c676b5449fbc8c92
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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