Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff081b4349dc9724…

MALICIOUS

PDF

77.6 KB Created: 2021-02-15 16:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5cbd8613e39d0dc74cadc9081a183033 SHA-1: 65b215c3414b2df9f5c0f8238680a24e49d3aa20 SHA-256: ff081b4349dc9724a638006cb7b6bd7c006556938597ef6f40af4193a746518d
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('baarspo.ru') and a query parameter suggesting a lure related to Zoom configuration. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are benign but likely serve to obscure malicious activity. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file, suggesting it is used for phishing or distributing a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=how+to+configure+zoom+for+music PDF link annotation
    • https://siburiwefud.weebly.com/uploads/1/3/1/3/131381052/warofuwubuget_zefujex.pdfIn PDF document text
    • https://sonoredepi.weebly.com/uploads/1/3/0/9/130969061/lafozaronutat_pedaf_mesodivulira_mitejaj.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/OrhhI18/37802721702.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/28a92368e.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/Sheiagh/mini_dash_camera_yi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_6009547701244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_60121e6e7d8b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_600797d59adf1.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/iijf4fU/plants_vs_zombies_android_sun_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366359/normal_5fc8124db12c3.pdfIn PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/8209612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wawavubuwile.rf.gd/disney_animal_kingdom_map_2018.pdfIn PDF document text
    • http://kabofed.rf.gd/xupadagevob.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/puxafuje.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/6132703151.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/3597162467.pdfIn PDF document text
    • http://dikefesuzu.epizy.com/96334603810.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/46256470773.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/psychology_lab_report_sample_apa.pdfIn PDF document text
    • http://refitebi.epizy.com/nipikerupobisise.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/tarijarobanexejejoxafodo.pdfIn PDF document text
    • http://fugewad.rf.gd/backdoor_roth_ira_tax_reporting.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_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 5064 bytes
SHA-256: 036e223e640bb5599be75119ec2b30d24165bcf0125583018ce7cf4e4ba4a192
font_01_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 10572 bytes
SHA-256: 219ad3e2284075eadc39ed625506f0a1ce4dfa47c51a32f3ded31f7f645c1731

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