Malicious PDF — malware analysis report

Static analysis result for SHA-256 969246d625d8cc50…

MALICIOUS

PDF

78.9 KB Created: 2021-02-09 06:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 95470cc439db82185886aac9cd02a19c SHA-1: 729d26e0bce16c1e7b2414c212a951606e913c22 SHA-256: 969246d625d8cc50bc790f33e03d7f1ce64a7aa71a4a77000ea74a6eb2b89c9d
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'crophysi.ru'. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to S3 buckets. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojan-like behavior. While no scripts were extracted, the presence of malicious links indicates an attempt to redirect users to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=massive+mimo+beamforming+antenna In PDF document text
    • https://cdn.sqhk.co/tezesafura/eghTibW/vogatar.pdfIn PDF document text
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/9a29dc015cdda40.pdfIn PDF document text
    • http://sobakin.space/blockchain_technology_in_indiangzam.pdfIn PDF document text
    • https://cdn.sqhk.co/gobikazifelo/fibuja8/7008553710.pdfIn PDF document text
    • http://ctyr.ru/78416731436xxb9g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_600802b5acb4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_60220606a84bc.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/jolituzoji/29105200226.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/calendar_printable_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/sefotip.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/all_hallows_catholic_school_farnham_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/forelarabuke.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/soundcloud_app_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/75841455941.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/risixigujokudip.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_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 5260 bytes
SHA-256: b139c4373143f035cffe6a5a565349e1188b99fc54cc86604a2b78b2351fb5de
font_01_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 10712 bytes
SHA-256: 219990bb47d93612df5d3114f6303eb365792e1292f2aa7a3eebdd30f56a7b8f

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