Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b09719766cd203…

MALICIOUS

PDF

67.8 KB Created: 2020-11-25 16:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2157d078f45d8706bc019086df2fa465 SHA-1: ba47bb29b7270f538c2f3b91dec17c226683b67d SHA-256: 32b09719766cd2039a341f7c4e44442fab2b0921757c008c9fd75140e6d88dea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 PDF_SEO_LINK_FARM heuristic and numerous extracted URLs suggest the document's primary purpose is to redirect users to a large number of external websites, potentially for phishing or malware distribution. No scripts were extracted, but the presence of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=fundamentals+of+pathology+pathoma+2016+pdf+download PDF link annotation
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/03c9c481a.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/mirolarejopaxow.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/7803f03.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/rowafibatosit.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/zasepo/18395211107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bea675c-6402-431b-adca-c4d85caa2b94/datemunesanupedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90676119-55a0-4245-a912-c98571273d02/27050057485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3044e66a-eaf3-4fbd-a4d6-caa4049c209c/vemudutevatigubipesag.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/verizon_wireless_early_termination_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f42cb7-86c1-4f2f-9cda-688b263fcd32/physics_final_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/boat_bill_of_sale_template_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa19969b-759b-41ab-ab40-9e0be7dddc2e/76649780958.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/materialismo_dialctico_e_histrico.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_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 5988 bytes
SHA-256: 49ee49ad29dab086c0dc43255861e3475058e2deaefadbfe94763168f185c21e
font_01_sfnt_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 10616 bytes
SHA-256: 24b6496d99f8fa501297d944463bf29aef722070a19ab7c3f4b760c221842430

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