Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd54aa4bb939d14e…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 13:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d9d8e59ff931b489f7554487da576a4 SHA-1: 8f94d08e970d016c63c095dd40fd7a1fe7a2a318 SHA-256: dd54aa4bb939d14e472e233907bffb14da9b99ac8ebf4524be5c84c4c8b764ef
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 are dynamically generated and point to other PDF files, indicating a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. The embedded URLs are used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=pelisdroid+apk+download
    • http://easycreditscore.info/93558929547nllta.pdf
    • https://cdn-cms.f-static.net/uploads/4410447/normal_5fdb983af07ff.pdf
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/fowasabekamadi-fiduza-sudewow.pdf
    • https://cdn.sqhk.co/kisasizaro/jfnjeid/events_and_adventures_dallas_cost.pdf
    • https://cdn.sqhk.co/nowonipewo/aayFJii/zudinix.pdf
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5fe057778c295.pdf
    • https://cdn.sqhk.co/sebidurubuze/bjbhbij/best_deals_on_tvs_today.pdf
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/latimiwoja-kejiful.pdf
    • http://acupofjacob.com/student_exploration_carbon_cycle_answershhxgh.pdf
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/renipudorerude.pdf
    • https://remitibomuko.weebly.com/uploads/1/3/4/8/134853657/benadafotam-telilevolimoj.pdf
    • http://bellissimo.online/26429754658uwcut.pdf
    • https://nobexuliga.weebly.com/uploads/1/3/1/4/131405940/dibegagos.pdf
    • https://maviwodoke.weebly.com/uploads/1/3/1/6/131606431/dasutepebapeno.pdf
    • http://wspring.space/folktales_worksheets_for_first_gradeyf1jd.pdf
    • https://cdn.sqhk.co/numokafas/RVif2yu/24487822095.pdf
    • https://cdn-cms.f-static.net/uploads/4493867/normal_601d7882276f3.pdf
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/mavorevagegilopekun.pdf
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/7674527d37767a7.pdf
    • https://static.s123-cdn-static.com/uploads/4411702/normal_5febd8337f690.pdf
    • https://nalimaxepizof.weebly.com/uploads/1/3/4/6/134662907/9987862.pdf
    • https://cdn-cms.f-static.net/uploads/4496151/normal_603ec86ccb91f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mejawiwomak/31801254426.pdf
    • https://s3.amazonaws.com/lomogas/bose_901_speakers_price_in_india.pdf
    • https://s3.amazonaws.com/lixuzo/is_the_jitterbug_flip_phone_a_good_phone.pdf
    • https://s3.amazonaws.com/mutirexa/how_to_structure_an_org_chart.pdf
    • https://s3.amazonaws.com/davolazupivowi/rovikudu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5da.bin
9620dca40b75baf9bafd1f8d765d91723cda051babf10bc74a373351597f0508		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 5112 bytes
font_01_sfnt_off0000f75d.bin
b8dbffa8cb1bbda0e6cb32a1c28276555fdc47f76109d09975c44e2abbc7f9f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 11812 bytes
font_02_sfnt_off00011e24.bin
f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16144 bytes

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