Malicious PDF — malware analysis report

Static analysis result for SHA-256 f373a8cf7f099678…

MALICIOUS

PDF

86.7 KB Created: 2021-02-28 11:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 810a2c63203c5da9fcaab013ed99b237 SHA-1: 31b4312a10a5d67d0383f424066a8344234acfa6 SHA-256: f373a8cf7f099678917ea9495677a837d6da17bfb68d931771f8f18d68becc23
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=building+collapse+in+new+orleans+cause PDF link annotation
    • https://cdn.sqhk.co/murerezusa/dheOibM/zanisaniw.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/ladofax.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/jacOjb1/revheadz_engine_sounds_apk_1._13.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/6320301.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/winojabiseg.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/woxotumomujajinegoladu.pdfIn PDF document text
    • https://bibevugu.weebly.com/uploads/1/3/1/4/131406802/3830738.pdfIn PDF document text
    • https://lobobofu.weebly.com/uploads/1/3/4/6/134680821/sobatokulikefa.pdfIn PDF document text
    • https://cdn.sqhk.co/desavusomo/jcdjhhj/autotrader_dallas_used_cars.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414498/normal_60003e0504ce5.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://kuwijiti.myartsonline.com/wajutuxakenatijelajafeguk.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/escape_room_movie_2019_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/nenibesef.pdfIn PDF document text
    • http://vawirir.atwebpages.com/dell_optiplex_7010_mini_tower_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/bowew.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/50673021502.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/gibojufux.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_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 5184 bytes
SHA-256: 01635d54b10f861ba1539d7fa0ba5984194eecee43da899514d1af02c9e54dae
font_01_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 11468 bytes
SHA-256: caa5fda034b92ca5c6caca22112afb8efbf51e8729674f13a0c88f4af812b9fe
font_02_sfnt_off00013f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F25 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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