Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb320bcfa84fb10…

MALICIOUS

PDF

76.3 KB Created: 2021-02-25 14:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b2dd21e6dd78680c87b096f74b97c258 SHA-1: bbf650edc8a47a0690e371bf90776030d19980db SHA-256: 4cb320bcfa84fb104318abe6f200a9c54cea189fe1211a3c72a6359bd75f9eaf
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/award?keyword=2012+honda+civic+transmission+fluid+change+interval PDF link annotation
    • http://gekifek.scienceontheweb.net/le_corbusier_five_points_of_architecture.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/rock_band_4_songs_clone_hero.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370737/normal_5fcbd59829d98.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/59691772111.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/hegihhA/38260012128.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/gjNieok/bike_mayhem_free_hack_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475738/normal_5fe32b95b113f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489058/normal_5fda749144e8d.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/rEiV4gc/58219446007.pdfIn PDF document text
    • http://lajenasuwo.iblogger.org/99985505069.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/qlikview_tutorial_point.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_6019d849243c5.pdfIn PDF document text
    • http://xilegutopeza.22web.org/funemabulatugodusigek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461229/normal_5fe3321f159c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwovejivu.rf.gd/the_chronicles_of_narnia_the_silver_chair_actors.pdfIn PDF document text
    • http://zewedazogiwake.rf.gd/78886803748.pdfIn PDF document text
    • http://suginutowukig.rf.gd/juludituk.pdfIn PDF document text
    • http://gojetovumivet.epizy.com/letter_template_your_address.pdfIn PDF document text
    • http://mifijikamipupu.epizy.com/fezikopo.pdfIn PDF document text
    • http://redebalumu.rf.gd/sosek.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/jowomarorujipi.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_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 5724 bytes
SHA-256: baa215bfc7bc5a1b4bc4cba34a557b91ec20aaf08c3c2dcce9715eb24ece060f
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 10552 bytes
SHA-256: b0eb99a8f63fe8d2cbce135d8157ba2f976b52d01b99f4acb1f4943b21c6944c

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