Malicious PDF — malware analysis report

Static analysis result for SHA-256 a303cefb6625a557…

MALICIOUS

PDF

81.3 KB Created: 2021-04-10 06:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3b43746d242296a70ea076ad7c3dd2b SHA-1: 152e5a6d9d774e460cfaaac51827bb2a4d0d807d SHA-256: a303cefb6625a55743aeb124c4196873b04b486f67276886ba2f3396a71dab98
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://zajinet.ru/strik?utm_term=machine+learning+with+python+cookbook+chris+albon+pdf+github PDF link annotation
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/pofilolupe.pdfIn PDF document text
    • http://zukesijinizik.mywebcommunity.org/jevawizuxivu.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/zamazolil.pdfIn PDF document text
    • https://jigaxokere.weebly.com/uploads/1/3/4/6/134622899/5678870.pdfIn PDF document text
    • https://tokitowopune.weebly.com/uploads/1/3/4/4/134498993/ed2f061999.pdfIn PDF document text
    • https://xizafezepogoja.weebly.com/uploads/1/3/4/4/134446531/73597257199ef8.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/32022931642.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/ukulele_songbooks_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_a1abd6c551f5414fa03ef54598bb9f55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/69179462885.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/gefabixalawexabinuga.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/kepatimuligirexisax.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_4fd23dd12ed0463c94cc689b6f37eeed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/kugawizevazuwizopiba.pdfIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_78f2405a503643318aecc0aa0349c293.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc63e404-2438-48f6-8f35-74a6dad8b20e/gizmo_evolution_mutation_and_selection_answer_key.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_c56bfe6b9cc64c47a61fc3e19052c975.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37912a6c-5182-426d-a386-82533cd71c5f/statistical_significance_confidence_interval_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/juzat.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_08cc102349f646ffa396066119af1d1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40853a11-c96a-498d-ba08-3d5331a91722/old_testament_bible_reading_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8593e80-71eb-427e-9f5c-0b811add7eed/kawasaki_engine_serial_number_decoder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db110381-d2ac-479c-9e0f-d7784363ff7a/vicks_starry_night_humidifier_filter_walmart.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_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 5820 bytes
SHA-256: 1533e304762b428f9f5adbfca0a4f7fa9a18222d42e0fced1d163eb660fe4257
font_01_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 10964 bytes
SHA-256: 6b23593eb6702ff3eee77bd0dd6095a27eed4e48d203629a940178d8c06186f3