Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29fb7e8ff223d70…

MALICIOUS

PDF

71.6 KB Created: 2020-12-19 08:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 48f42ed9b83d29f90d425137283d2c16 SHA-1: 72fff5ef226d4e6309ecf83c2d072e3380454a25 SHA-256: a29fb7e8ff223d70f1579280f0205e5f76b8f4f9d93716309c8e5e9610c8be4a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting an SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious or spam-related content.

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://trafftec.ru/strik?utm_term=cross+country+logo+designs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413467/normal_5fb50b16a8ac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5f8bfd2f2e65b.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/tavupobajesejepivat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f8aab7ce69f2.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/nopapaxonez_tafasonigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403263/normal_5f93cd5f178f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_5fbb0215126a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe08786457125654013322/1606289539486/3683774130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a97193-fcd6-438f-887b-7132ca22aff6/6011233315.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/wetafogekixesujafelol.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b2ef2cf09257bd8c543f/t/5fd64322ab777271768a8e95/1607877411322/32855735460.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6941c1452f90b7f0c5d7b/t/5fd0797b3364176a125d4417/1607498109816/best_simple_music_player_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/weather_report_today_in_my_location_hourly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7688d731-c9ea-4d01-96b4-99afa6b0b76d/fupaxibevigo.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/92004569446.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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 4904 bytes
SHA-256: 78efef23bdd49746cebd8d4da50fe36f86465533e9360559147c635e01763bf1
font_01_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 10376 bytes
SHA-256: 37ddf250ed67de51034bb643f8f5e6affd53d3bbeb7cb31dc216fdb9113aa5f2

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