Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5eb4f4665bb24b…

MALICIOUS

PDF

94.0 KB Created: 2021-05-13 07:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: de4ae64b9cba429dc75974a99a82cf40 SHA-1: 2b47f42968a076169499162e2e314d4b9eee2de3 SHA-256: ae5eb4f4665bb24bf1d57d825673130e67f5bfdf97fbde0f0edf1e4d3eeb9b9e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a product review, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/strik?utm_term=duraflame+infrared+quartz+tower+heater+review PDF link annotation
    • http://xexegojadesuti.22web.org/journal_of_statistical_software.pdfIn PDF document text
    • https://nipixosawapur.weebly.com/uploads/1/3/1/1/131164079/54947fa9109467.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/hindu_arabic_number_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_6039378926182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_601a1b7babe71.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/antecedentes_historicos_de_los_derechos_humanos_en_mexico.pdfIn PDF document text
    • https://zufodivovogopot.weebly.com/uploads/1/3/1/3/131383523/muxebupeborupow.pdfIn PDF document text
    • http://fenogavalos.iblogger.org/functional_analysis_in_clinical_psychology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_60591e4218d5f.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://jatuxijor.epizy.com/full_catechism_of_the_catholic_church.pdfIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_a075fcae696b40b3a7278b81e42377ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/get_tough_laws.pdfIn PDF document text
    • http://vimetogobosibim.rf.gd/63961535233.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/manizenugaxedavutuvu.pdfIn PDF document text
    • http://kobesut.rf.gd/metallica_back_to_the_front_book.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_acf0ff91e34b48f9869e81c9ff05ae7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/walmart_attendance_policy_2019.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_55869854165f491c921d6c3727b4c282.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/car_sticker_design_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/kesuwase.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/garmin_forerunner_305.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_a9dc368c613d45eaa2c56db082cb4d4b.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_c15c988e93244d9a8f1a3e23173f8728.pdf?index=trueIn 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_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 5180 bytes
SHA-256: 36fdd95049d8efe492c506ed7c115805be9ca824f431045467407a3a706f3ba7
font_01_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 11864 bytes
SHA-256: 99c55e5ae7e0f5bde8df6f63ee5829e8c764978056e72357e85558b5d983e8eb
font_02_sfnt_off00015c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C10 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176