Malicious PDF — malware analysis report

Static analysis result for SHA-256 161aec8b42dac46e…

MALICIOUS

PDF

72.3 KB Created: 2020-12-15 19:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 63f12905be34966ccf1335daf0846fd2 SHA-1: e9a3f9148f5be80c0770290104fbaf99929ce35e SHA-256: 161aec8b42dac46e147dbc586d99c8ba4daa35a2ead22a10c180b317368c3268
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm, suggesting an attempt to direct users to potentially harmful websites or downloads. The presence of embedded URLs further supports this attack pattern.

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://trafftec.ru/123?utm_term=vsco+mod+apk+old+version PDF link annotation
    • https://lesorini.weebly.com/uploads/1/3/4/3/134376350/eed0c9a5d.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/fapalovajuv_pitepibabigopep_kigovi.pdfIn PDF document text
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/nugoxeb_tonofuvewarep_xejotakipe.pdfIn PDF document text
    • https://rutizinudepedo.weebly.com/uploads/1/3/4/4/134483735/1912517.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/1329e90.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/2615887.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/rotowan/tesidunofelebizimuduni.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d12c3dfdd95b60d4a66f/t/5fc74996efc65c5b7a404a2e/1606896025149/19219594827.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4da975bcb0228a29bc7b8/t/5fc66d1bbc819f1cf4b51724/1606839585708/lewefu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54772bdb33045eedf12bd/t/5fc5f7eb9b1ed03538ab6ee2/1606809584767/migobagimawujaxeg.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/minna_no_nihongo_fukushuu_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36ff3c6d9645836323309/t/5fcf0b6db8233e30dfa28c4d/1607404398017/marco_s_pizza_bowl_coupon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d99edfd-c3d4-47d0-953b-6be1e1f71208/32770348259.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 5308 bytes
SHA-256: 2849577c115ddcf1a932385ec17860abea250803a6c4a8c8c198ea557e27fb6a
font_01_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 10876 bytes
SHA-256: b1d726274a861f54d2a9dd8043dcd02cb6b84d29936da81daa0d71a6ba5836dd

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