Malicious PDF — malware analysis report

Static analysis result for SHA-256 821e5ebbab4b4b84…

MALICIOUS

PDF

81.7 KB Created: 2021-04-25 14:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 11908df879268f4f9a3f3205ccebf9d6 SHA-1: dac96cd4902a071f62598b75fd1fecb48f3516de SHA-256: 821e5ebbab4b4b84b0a092e6b6d56373e5b43120dac3aa2e65245d1d7af1ff45
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or are used in a link farm, indicating a phishing or spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=delirium+book+review+and+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5fe8aee627b48.pdfIn PDF document text
    • http://promooffer.site/the_oxford_dictionary_of_science_fictionl6xuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_604f357fc9c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_6021cc194dfb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377113/normal_5fe50605437a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457848/normal_5fe2ee84032d7.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/28435120505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fd2e4504a459.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/manikuvixoxed.pdfIn PDF document text
    • http://prodson.space/life_smart_infrared_heater_partspuk4v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_602454dc5806b.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/58037920312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464530/normal_5ffb66fca6375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495251/normal_6002824e1c9bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_6045c28b0475e.pdfIn PDF document text
    • http://testvvd.xyz/379263700azvoc.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/16633654520g72w6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_6016ba39ec8aa.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://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_7ad23276097b4a92812ed139510b33a3.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_f1dfa8562aca48a48fa00f2a17b876bc.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_289cb6f56eef4c94be692fcc86dc8071.pdf?index=trueIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_d43d0528e8fe4d75a7462e3790436613.pdf?index=trueIn PDF document text
    • http://faxevimisosideg.myartsonline.com/wubazomi.pdfIn PDF document text
    • http://wororezijetixa.atwebpages.com/vurap.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_ad06844634424046a8197b0fac82eca2.pdf?index=trueIn 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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 5228 bytes
SHA-256: 7de64bb527520e6c13bf1d9af7f2e009a5094415ce08c467f41657424b58950a
font_01_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 11344 bytes
SHA-256: 38414d61efbc467e5a1372676b7d5743050a61d3faa11f42fb5c15440d895f85
font_02_sfnt_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.