Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9340e8f290bb2a…

MALICIOUS

PDF

74.8 KB Created: 2021-02-24 18:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f8647d0301fd277aec0b64938342d7b9 SHA-1: d0186b3098db57ed1b793b8ea4112dabb8012638 SHA-256: 5f9340e8f290bb2a06e5dc6411a3c6be7d6549b0b8440634d7b7392b2306e061
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://crophysi.ru/award?keyword=charter+spectrum+tv+remote+programming PDF link annotation
    • http://nuveclovet.xyz/starbucks_margherita_flatbread_caloriesad2ce.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/sasubawowisi_kowemazolarama_fikodav_mekutanuzo.pdfIn PDF document text
    • http://kamaz-ftc.com/sawiwdqpgu.pdfIn PDF document text
    • http://kyrgyztours.com/tamumokolulekefuvepg2oo.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/renewable_and_efficient_electric_power_systems_solutions_manual.pdfIn PDF document text
    • http://moymagazin.xyz/551085506438b1ky.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fe66d139460e.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/how_to_clean_ratchet_straps_by_dirt_farmer_jay.pdfIn PDF document text
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/ecaa1fe94.pdfIn PDF document text
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/baa1ed87.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/7297764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fc715892d2d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5fcef0c6de8ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503525/normal_5ffdfc0c76e16.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/fender_mustang_gtx100_modelling_combo_amp.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/eureka_forbes_vacuum_cleaner_service_centre_in_coimbatore.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/fukezavazuj/asphalt_7_1._1._1_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/bat_pati_full_movie_punjabi.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/91951627145.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/fagadufo.pdfIn PDF document text
    • http://bitines.myartsonline.com/40308573633.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/1514365008.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/mandatory_reporter_training_online.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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 5280 bytes
SHA-256: dc73bbeda81279879426f8f4f9516cacfbc4fdad43e97a326bcc1b5f86631ebf
font_01_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 10368 bytes
SHA-256: 65cfed81acf991c488d032693fd4ff8460949a9824c6775939fb5a9985612666

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