Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ae58f2ea4abb30…

MALICIOUS

PDF

68.1 KB Created: 2021-02-27 18:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 70ccce1042e8b14eb27013fd7c69b9e2 SHA-1: 0db680359a6b6e3f6495b29d638ba2f857685b4b SHA-256: a1ae58f2ea4abb305691381bef6474378b74bb4cba398656c62405ea20ce5061
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs, 'https://resalured.ru/award?keyword=brother+ls+1217+extension+table', is directly associated with the malicious classification. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=brother+ls+1217+extension+table PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384308/normal_6007ecd360436.pdfIn PDF document text
    • http://podeves.xyz/bizogek87cg.pdfIn PDF document text
    • http://yoga-italy.space/self_adhesive_pvc_sheet_for_photo_album659ji.pdfIn PDF document text
    • http://magnitoli-2ekran.site/60706662567h5d2y.pdfIn PDF document text
    • https://moredotaze.weebly.com/uploads/1/3/0/7/130776260/884924.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/871585.pdfIn PDF document text
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/ginekulusawezul.pdfIn PDF document text
    • https://jitijukuvag.weebly.com/uploads/1/3/4/7/134743274/fojizawososozujepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_602c413b8f2b3.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/3b10fc1305d221.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/savifin/kigegotud.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/fekekuguv.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/free_portable_antivirus.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/nikuzupolu.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/pigowokipenek.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/10629872578.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/pumosedinozurupuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/call_recorder_apk_for_iphone.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_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 5296 bytes
SHA-256: e48b09592bc71b2ec6420ce82fe841b0d1019328e27e6754f0fec4531d54c71b
font_01_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 11220 bytes
SHA-256: 86dd92c17c56a3c29c2c9638f52fe83248b633b17cc17c70bd7285f1a543d1e3

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