Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2833786adc35b20…

MALICIOUS

PDF

76.3 KB Created: 2021-05-07 07:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a8faa6f14807759312ae0909ec501c7d SHA-1: 5b5214feba834e44e1acfed20bfa6c8d950ac8d9 SHA-256: a2833786adc35b20630d8c45fc444e7627adc3434be8960c8079d3ea538ae5de
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-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://nipisod.ru/strik?utm_term=a+que+se+deben+los+pitidos+en+el+oido PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390055/normal_5ff49fd38b88b.pdfIn PDF document text
    • http://rastet-malysh.ru/9107663359kpacx.pdfIn PDF document text
    • https://sodejokare.weebly.com/uploads/1/3/4/3/134349501/9689389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_605480a35da5f.pdfIn PDF document text
    • http://pro-komp-master.website/ho_adivasi_dj_songs8z89.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/vovan.pdfIn PDF document text
    • http://copyrightviolationcenters.com/chocapic13_toaster_edition_1._14._4iz3s9.pdfIn PDF document text
    • http://kezijumedet.mypressonline.com/69382803918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_604424c198bdb.pdfIn PDF document text
    • http://rozel.ru/66909249428hsn60.pdfIn PDF document text
    • http://forexgeeks.net/48988732670skrnm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fcf3d24724f9.pdfIn PDF document text
    • http://monongzhlh.space/12114991715ww0jo.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/barron_s_ielts_practice_exams.pdfIn PDF document text
    • http://guvinesusavilo.iblogger.org/affidavit_of_service_format_chennai.pdfIn PDF document text
    • http://busibear.com/54396725641rilll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_6056cbd068e33.pdfIn PDF document text
    • https://kijojodifufu.weebly.com/uploads/1/3/4/3/134317180/da95d1b2334f8.pdfIn PDF document text
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/zanexubusatexi-zoger-bugibo-potedik.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/lumoponoramiwiw8jwkh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumizasikoxef.rf.gd/forklift_trainer_certification_requirements.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 4904 bytes
SHA-256: 6f6a39c5fcd2d069c18ff0fd50928b776f648fd263415eff675c6d544485e221
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 12028 bytes
SHA-256: 3148a0e29eb575b3e7cb0936851ff806e929de401fd53f2317e5b0a369f9a075

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