Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f4053c1a1e5d98…

MALICIOUS

PDF

75.4 KB Created: 2021-03-01 18:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0667c9cd17c1ce853e7b693fe379f39f SHA-1: 8d94d457a9a8412df9c07709de1a3c0264d4c186 SHA-256: 02f4053c1a1e5d9824e442aaa16a081974f4b36ebeefe9a9aaf7818d11061200
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, with `https://jottigo.ru/award?keyword=what+establishes+a+relationship+between+two+quantities+is+not+proportional` and `https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/bawivu_kolafinuj_sevize_tikevukawodufew.pdf` being prominent. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

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://jottigo.ru/award?keyword=what+establishes+a+relationship+between+two+quantities+is+not+proportional PDF link annotation
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/bawivu_kolafinuj_sevize_tikevukawodufew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5feeb1b13f5c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_6027a8d4deeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_601718a67db2f.pdfIn PDF document text
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/kejepifupulexa-nobab-nefesegojiwelej.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/togaruxoxagevebage.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/d234e44d15.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/jedaxopopuko/aankhen_full_movie_moviescounter.pdfIn PDF document text
    • http://kokibitumoxa.epizy.com/86614018633.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/somatic_cell_hybridization.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/66634935454.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/jariralawapadatat.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/complete_bible_dictionary_apk.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_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 5276 bytes
SHA-256: c01b9c184604efaa4aeb45c749acc45033c050cd6da74dc459b1dd144924658d
font_01_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 10460 bytes
SHA-256: 404c668be45d14ff8509e7957ccf3403e5e8ce3293851171844234a0a997a888

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