Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5089bce34a28f8e…

MALICIOUS

PDF

82.0 KB Created: 2021-01-26 03:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 76d3e6697211add1efa0dadc8df2f8ee SHA-1: 20be769aad4274458fb4a345e040234af6935749 SHA-256: f5089bce34a28f8ec28eb55615453772412d4505faf758cfe96554d6ac20ad04
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The document body, though heavily obfuscated, suggests a lure related to biblical questions, while the numerous embedded URLs point to disposable hosting, characteristic of phishing or malware distribution campaigns. The presence of external URIs and link farm behavior strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=preguntas+biblicas+con+respuesta+y+cita+biblica PDF link annotation
    • http://fresh-ita.fun/groovemaker_2_freef7zny.pdfIn PDF document text
    • http://com-servers.online/8187160295590trp.pdfIn PDF document text
    • https://cdn.sqhk.co/weralutofa/c7aqSja/faily_rocket_mod_apk_10._14.pdfIn PDF document text
    • http://gitilapen.66ghz.com/86774223014.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/1c6bc9bb84dbe.pdfIn PDF document text
    • https://jejenovo.weebly.com/uploads/1/3/1/4/131454593/2528368.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/d73849a9508.pdfIn PDF document text
    • http://immortal-sho.club/scary_halloween_mazes_near_mex9wnp.pdfIn PDF document text
    • http://pipexob.66ghz.com/15228971292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xapimiwosusuv.epizy.com/18266932956.pdfIn PDF document text
    • http://sujetokotew.rf.gd/aptoide_app_for_ipad.pdfIn PDF document text
    • http://dulaxidej.epizy.com/kielbasa_sausage_sheet_pan_dinner.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/trigonometric_identities_1_sample_problems_answers.pdfIn PDF document text
    • http://gokobuvutojo.epizy.com/reading_comprehension_grade_3.pdfIn PDF document text
    • http://fizenigapajawak.epizy.com/mariage_d_amour_clayderman.pdfIn PDF document text
    • http://bunetexugefu.rf.gd/varillas_de_radiestesia_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 5228 bytes
SHA-256: 5d72329d89794a6ab65885d9ea2ecce325e294bbdf8adb72153340460a260451
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 12632 bytes
SHA-256: 9b8d9edc3667729d9cba7c7cc722c67273270928682f5093596a6c193cb2c6f5
font_02_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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