Malicious PDF — malware analysis report

Static analysis result for SHA-256 64633dfe46970631…

MALICIOUS

PDF

80.5 KB Created: 2021-04-07 22:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 40d485459851a964d09bdf573fab165f SHA-1: b0f1779920ac0020f4aa366ab9803c1d7f39c787 SHA-256: 64633dfe46970631361ac28d29a59593d09d22be1a361737943ee9817cc31e72
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and S3-hosted PDFs, characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the malformed stream length and URI heuristics suggest exploitation or redirection to malicious sites like xezojetit.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://xezojetit.ru/wix?keyword=marsh%25C2%25AE+manual+kraft+tape+dispensers PDF link annotation
    • https://wetevuwerego.weebly.com/uploads/1/3/4/8/134896505/pibeva.pdfIn PDF document text
    • https://jetukuzimol.weebly.com/uploads/1/3/2/6/132695660/417248.pdfIn PDF document text
    • https://zisibunekotif.weebly.com/uploads/1/3/4/9/134902626/pelezajemove.pdfIn PDF document text
    • http://datab.vip/transformer_fond_blanc_en_transparentvz6hx.pdfIn PDF document text
    • https://xigizimevavas.weebly.com/uploads/1/3/5/9/135982966/buvuf_lowavavez_dimesopak_vugajewir.pdfIn PDF document text
    • http://awpmode.com/47394323498hs7jv.pdfIn PDF document text
    • http://uplrezina.site/carl_jung_the_undiscovered_self_amazonr3kj3.pdfIn PDF document text
    • https://bokefelefu.weebly.com/uploads/1/3/1/3/131383825/6974930.pdfIn PDF document text
    • http://salleapp.xyz/gundam_scratch_build_manual_englishtyir3.pdfIn PDF document text
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/2377194.pdfIn PDF document text
    • http://misstourist.info/38905344964erdjx.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/2690323.pdfIn PDF document text
    • https://wejatinolu.weebly.com/uploads/1/3/1/4/131438249/84579339f7e39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wekibik/jorge_luis_borges_ficciones_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/zenemozifumef.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_21f6a36d476e4be4b795d94a06988d4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/49086894754.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/zumuzenesiw.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_f7b9b8e17ea442acb311650f7ce591f4.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_475efcdc2da1416bba388cc6dcba7102.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/carbaminohemoglobin_is_formed_in_the.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_ac1b53a374d94f0fa03f8f38e3a4679c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mosezavor/lowazotefatirulumug.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/is_grandma_got_run_over_by_a_reindeer_on_hulu.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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 5592 bytes
SHA-256: e805cbc6144be0f9f947176a7ad43a2a22b9774a8820268a3c29355447763fb2
font_01_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 13004 bytes
SHA-256: 0f79e2756b3b5308556d82825adf5c8e3c2f47565344cf96d99d986c0e87f573

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