Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f90a3ca091e5128…

MALICIOUS

PDF

61.9 KB Created: 2020-11-23 21:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 81c609297d845b59ce0ebb685e8a50f8 SHA-1: 61865986d349fca5680aa8e065bab556f9d0c50c SHA-256: 3f90a3ca091e5128d1b124d1c616b7cdc6133d91f3180b4af16bdd01a668b9d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to 'free books best sellers'. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=free+books+best+sellers PDF link annotation
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/797185.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/992b55e2d7207.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/zalekilinunogat.pdfIn PDF document text
    • https://rekenapun.weebly.com/uploads/1/3/4/8/134851377/kijajejizokiz-xabeze.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/saguzowinerovev_ziwukos_jafuwibobaxejam_zivis.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/1352491.pdfIn PDF document text
    • https://welerenumabo.weebly.com/uploads/1/3/4/4/134467224/5615489.pdfIn PDF document text
    • https://gajitiromivalot.weebly.com/uploads/1/3/4/4/134475956/kisevomolosore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cf9f4a-6f4e-4331-821b-1f8e80043a22/editable_calendar_template_2019_for_prek.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/60247329268.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/joviro.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/27832965845.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/ralukubepawo.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/toxemixig.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/muscle_size_gain_workout_plan.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_off0000b5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E7 4628 bytes
SHA-256: ad70b5f7f48571345df538b87824fdeb96af76e8ce8bcb14269f4e280d674ef5
font_01_sfnt_off0000c5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B7 11588 bytes
SHA-256: b5ae69931a3c96622c055a647cb0ed6b2b832438cfa7169d00469c02643fb9ce

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