Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ca49cfab7f00d7…

MALICIOUS

PDF

76.4 KB Created: 2021-04-12 23:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 638b31b84fa5c1fb8c24af7ac24e44cd SHA-1: 9feca868da0a33df7014eedaa058d44ac4f89ce7 SHA-256: b4ca49cfab7f00d7fc7e0cd2570c6c94b023e72cad23814fbc46fced92ddd25e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a deceptive purpose. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/strik?utm_term=acer+aspire+e5+575+battery+not+charging PDF link annotation
    • https://vugovarekuluf.weebly.com/uploads/1/3/1/6/131607096/06b5a018697.pdfIn PDF document text
    • http://dusexixegiseves.iblogger.org/dipropionato_de_betametasona_bula.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/c09460c07d.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/faduxodiwo/vujetotiluru.pdfIn PDF document text
    • http://zimaroted.rf.gd/zotet.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/english_grammar_lesson_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/how_to_write_feasibility_study_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/how_to_identify_which_hardware_component_is_failing_in_your_computer.pdfIn PDF document text
    • http://tumurubulofomam.rf.gd/xizomadiw.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/iycf_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/xanaluluxemumifaxutujij.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/2003_saturn_vue_transmission_fluid_check.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/berlin_sans_fb_demi_bold_italic.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/57638220801.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/93819235696.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/53605503501.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/diabetes_in_pregnancy_guidelines_acog.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/antropoloji_ders_notlar.pdfIn PDF document text
    • http://sewugobavi.rf.gd/final_fantasy_xv_prompto_dlc_trophy_guide.pdfIn PDF document text
    • http://pimubejat.epizy.com/chrome_browser_apk_for_android_2._3.pdfIn PDF document text
    • http://tosalovubel.epizy.com/fuxolevenapududanesun.pdfIn PDF document text
    • http://guligovidafijew.rf.gd/absceso_periodontal_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/47832222578.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_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 5596 bytes
SHA-256: 2c8b6be969fac3694678df3f1d2755033ee901028af33a2e8b7d7f38542790d2
font_01_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 11256 bytes
SHA-256: 7c015a95390810ebf941298dee2d2040dfb2df2568390ce91087ed2ae93355ce

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