Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccc501cf0a4d9e2…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 22:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75ead42fe4f0833642a870293c060ee2 SHA-1: 25d668f4c448784ab27e322fe89e77ff6c100fd1 SHA-256: 5ccc501cf0a4d9e219fb63d2adf1624b0482fdbc5f50f81bcea1894f16d8b5e0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings, but one specific URL, 'https://jumiwimov.ru/strik?utm_term=how+to+change+rip+curl+watch+band', is flagged as unknown reputation and is the primary indicator of a potential phishing or malware distribution attempt. The presence of 'curl' in the document body, alongside other obfuscated text, suggests an attempt to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jumiwimov.ru/strik?utm_term=how+to+change+rip+curl+watch+band
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/midozopapu-bizemijonorikex-vudirotilavo-kofotuzevekixe.pdf
    • https://cdn-cms.f-static.net/uploads/4480735/normal_6047b7fe1ca67.pdf
    • https://sasasukaga.weebly.com/uploads/1/3/4/6/134624721/7379755.pdf
    • https://dolivosogokate.weebly.com/uploads/1/3/0/8/130874088/241950a.pdf
    • https://cdn-cms.f-static.net/uploads/4368956/normal_60136473ac383.pdf
    • http://amsidgi.xyz/how_to_turn_off_oil_maintenance_light_on_2010_toyota_priuss3zdn.pdf
    • http://batmbatm.ru/raymarine_e120_for_sale_ukpb6bo.pdf
    • http://m-ryanaf.site/79471638174faupo.pdf
    • https://tafugamukizigip.weebly.com/uploads/1/3/0/7/130775106/ff050faabad.pdf
    • https://cdn-cms.f-static.net/uploads/4383131/normal_600a9279bfd29.pdf
    • http://velesvoyage.ru/ejemplos_de_ttulos_de_crdito4uvnl.pdf
    • http://gojawufeki.getenjoyment.net/xoxexuxovakupota.pdf
    • https://cdn-cms.f-static.net/uploads/4370275/normal_600c7ac1173d1.pdf
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/2281062.pdf
    • http://kidufamipowanot.mywebcommunity.org/tezoradowes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gizonukorad/what_are_the_different_types_of_array.pdf
    • https://s3.amazonaws.com/bededuxotulapil/speak_now_oxford.pdf
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_48d99ef8ce65482caec0ece43e0db12e.pdf?index=true
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_ac529cad4959404697160e187e4c828f.pdf?index=true
    • https://s3.amazonaws.com/nemafu/oxford_german_dictionary_apk_free.pdf
    • https://s3.amazonaws.com/tikofaketonub/sbi_checkbook_form.pdf
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_3cdde7228ff941169e694af72fdb3e58.pdf?index=true
    • http://bokawevetejap.atwebpages.com/xiredobudizibuxobovuvebul.pdf
    • https://s3.amazonaws.com/kovezux/tunetixib.pdf
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_8eca47275b554452aa991f895c9aaf62.pdf?index=true
    • 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_off0000ece5.bin
dbfbac1790583c73c88583827fc24db57d5c4084a45f5821ca3451d9e96505cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 5352 bytes
font_01_sfnt_off0000ff1c.bin
2b1a4a40c208ed931247aecb67d57d5d37fd15cc1476e7dd62959ef9c883e18c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10460 bytes

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