Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d5a7d2947485d8…

MALICIOUS

PDF

83.4 KB Created: 2021-03-30 09:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f911d8156b21649006432f2e48e41d93 SHA-1: 3dc6ff547a108e0222ae194e511e5043d0bf3257 SHA-256: 24d5a7d2947485d8e79a26dde0cae0650dfdbce7db22a6c41218cd821ce3c5d6
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous external URLs suggest an attempt to create a link farm or redirect users to malicious sites. The primary URL, https://pelibifir.ru/wix?keyword=data+structures+and+algorithms+in+java+karumanchi+pdf, appears to be a lure, disguising the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/wix?keyword=data+structures+and+algorithms+in+java+karumanchi+pdf PDF link annotation
    • http://onlinesos.tech/dimensional_analysis_worksheet_1ijbo3.pdfIn PDF document text
    • https://nefakemibozike.weebly.com/uploads/1/3/5/3/135314079/xujepobusi_lofome_sozunoramuje.pdfIn PDF document text
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/dokuraruwiwem.pdfIn PDF document text
    • http://trylait.pro/ladefadibapoxixezroqou.pdfIn PDF document text
    • https://banezinalirunod.weebly.com/uploads/1/3/1/4/131437453/suxazokaxa.pdfIn PDF document text
    • https://padukasafif.weebly.com/uploads/1/3/4/4/134404544/5833617.pdfIn PDF document text
    • https://kisumeselebo.weebly.com/uploads/1/3/6/0/136021012/8940952.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/ad929d8d.pdfIn PDF document text
    • http://liketime.online/nemivebowukiwuse7gpmb.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://tameenegypt.com/nujubijojuwebegipmq7d.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/47871848744.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
    • https://s3.amazonaws.com/wibedubosateg/55573848990.pdfIn PDF document text
    • http://vuxepogi.atwebpages.com/namipolosekasi.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/2444796393.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/gmetrix_ic3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/nafewepixize.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/sum_of_infinite_geometric_series_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/64101989339.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/extra_deep_pocket_full_fitted_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/12100422325.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/87629860073.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 5648 bytes
SHA-256: 31b912a0599966c0b6b3138e9c3186ca008cd5f49ff7876112fcd93bde16a3cd
font_01_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 11488 bytes
SHA-256: 89d22338f51accf51af46da4537538f251b1471ef06526f7f7a2f093abe2489b
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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