Malicious PDF — malware analysis report

Static analysis result for SHA-256 12640a891392591d…

MALICIOUS

PDF

82.2 KB Created: 2021-05-23 20:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5c89213c9ff3e9f590e9bcfdf184b13f SHA-1: d28ae6482d1a331776a8af28bba92067604dfbde SHA-256: 12640a891392591d2a61e8d2307d37ca1afc2ed65cf35d21e6b2dfa9f0529bbc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs point to suspicious domains, including one with a 'strik' endpoint and a 'how to promote business owner' query parameter, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=how+to+promote+business+owner PDF link annotation
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/bibanuzisota-memoranevuruxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_605d6947c3def.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/widukojikirafeludo.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/werivizefu.pdfIn PDF document text
    • https://wojafegozotug.weebly.com/uploads/1/3/1/6/131606577/titaximujajes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485310/normal_5fd61dee2ac7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_600a8982ae5c5.pdfIn PDF document text
    • https://pevolevu.weebly.com/uploads/1/3/1/6/131606362/pimug.pdfIn PDF document text
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/a8e317a5f9d7c.pdfIn PDF document text
    • https://zenugewitewane.weebly.com/uploads/1/3/5/9/135960096/tagevosalov-varaxepidewudi-sonojozowegopo-pinew.pdfIn PDF document text
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/b216b.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/0274656a.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://uploads.strikinglycdn.com/files/b1317b20-a1d3-4dbe-809d-67957dd528b0/orbit_irrigation_timer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4235239c-06a1-4b11-8d74-563d401d4841/convertir_gramos_litro_a_miligramos_decilitro.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/dutejebobafabenotokugu.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/silent_love_song_djyoungster.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/sharp_objects_end_credits_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/041d7541-d5cc-4ba4-bb63-547fe7085249/what_was_the_fear_of_the_iron_curtain_descended_across_europe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8642ec7c-3493-45e0-85b3-c8da88ec3bd8/liwapofuruxewupavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d65656-6bb2-45cc-bc94-ea432351291e/larir.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_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 4796 bytes
SHA-256: 5f003d1dc56354d7e17d1cd8218dc3e17a900a338577dfc8c92535e1fd3000ef
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10856 bytes
SHA-256: 700b9eaf4dfe6cecbf08bd29948347b9ca4b7b1f0938cdff0ac98c5a67ef1c40
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333