Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbca1fe1ab0e262…

MALICIOUS

PDF

77.3 KB Created: 2021-03-12 09:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51b11a506f20ff7785cbcdbb875a2c2d SHA-1: 50afb9ee4104a2954399433f84befaeb9d9420fa SHA-256: fdbca1fe1ab0e262ac1d9f54908c683b020b128a05025e0f8eb3708933567b61
156 Risk Score

Malware Insights

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

The PDF file, disguised as 'budgeting books pdf', contains a significant number of external links, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=budgeting+books+pdf
    • https://watuxiso.weebly.com/uploads/1/3/2/7/132740831/wozoxaf_goroganugem_dopopagurif.pdf
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/8487713.pdf
    • https://lebugaboforov.weebly.com/uploads/1/3/5/9/135976333/jelaniwebe_fevogore_kumavanejubeti.pdf
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/4b6baaf208b976e.pdf
    • http://gatorama.space/260814139795jbb7.pdf
    • http://jushq.pro/torete_easy_guitar_chords_for_beginnersbc0gs.pdf
    • http://gloslides.com/41995720612c1aql.pdf
    • http://wrestling-mma.com/bunevevolitudejadaxaluikuil.pdf
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/5626962.pdf
    • http://worodariravo.22web.org/git_command_to_push_code_into_repository.pdf
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/dokupijamasatos.pdf
    • http://rutefozur.22web.org/74679145629.pdf
    • http://gejopuzebizovuk.iblogger.org/86503479687.pdf
    • https://jovovanin.weebly.com/uploads/1/3/1/8/131871717/1538661.pdf
    • http://naturapple.space/treasures_6th_grade_grammar3jtba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://losuguv.epizy.com/zebisifazetaburaturit.pdf
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_7bbacb1144134a67920d4e2673b6cb23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f9ed8d2e-4926-4418-baac-fc99d7e42389/kugava.pdf
    • https://uploads.strikinglycdn.com/files/cbea3d75-c7d2-4a72-9168-33f5406ec675/black_and_decker_gh3000_manual.pdf
    • https://uploads.strikinglycdn.com/files/a0752cac-ec42-4988-976e-71f8746e9dbf/much_ado_about_nothing_quotes_benedick.pdf
    • https://uploads.strikinglycdn.com/files/adb0a874-10e8-4dcd-bf5d-21b29221cb24/romantic_mystery_book_series.pdf
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_1e8e2150a8984b109d52df737f21a33a.pdf?index=true
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_4984cd358fdb4e42b4def5f05449720b.pdf?index=true
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_468ab81738cd48d1b13534f0120bc1f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7cd62151-9c27-425a-8773-5307f78c1aef/tactical_self_defense_classes_near_me.pdf
    • http://wafutevulutud.epizy.com/93152017052.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ce.bin
1541c57f4f78232de6c8736f47f2a906b0a3471bc37fb31b9373f5d2a6db6e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 5124 bytes
font_01_sfnt_off0001045e.bin
b9d6e98498bb1ba49100f7ebdf25e65fc839cb434e746ff170502c0938b3f8d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 10396 bytes

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