Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cf53fe0bed8f70…

MALICIOUS

PDF

77.2 KB Created: 2020-12-21 04:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 656d5664cc57ac96bd43829342635447 SHA-1: 9567decde9b1751626383617ddf39e9751c29d62 SHA-256: 90cf53fe0bed8f7044e9850bc5775425df79df9cee3bfa8b0e2ba80e386904a7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One of these URLs, https://traffnew.ru/123?utm_term=stranglethorn+fishing+extravaganza+guide, is directly associated with the sample. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery via these external links.

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
  • 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://traffnew.ru/123?utm_term=stranglethorn+fishing+extravaganza+guide PDF link annotation
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/ff2dc8ab7c5019.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/6519702.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/bebevojavafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc11d1c2bbd74065807c487/t/5fcee00eba7003536e9bb625/1607393294895/defozuwuwesezuvugawep.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc783e939503a47f6fdd85a/t/5fca0383887b444c615b414f/1607074692754/70s_music_artists_a-_z.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14088c09-d54d-49da-8f5a-21ea32b323b6/pathfinder_vs_5e_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/mesivusoburimuranokosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfaea73-1095-4ef6-97e5-b526156ffda7/ihagee_parvola_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d351b9b3-2ba0-45bc-885c-e5dc41edcb3c/brady_games_wow_strategy_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13cf30a2757459be51ac1/t/5fc480009d793648401e3dfb/1606713350830/death_stranding_legend_of_legends.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/7262142965.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66998d49dd124475a272a/t/5fc72f71a907d7439cd5c4d1/1606889330021/vazilivegidojazetuxuvi.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_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 5332 bytes
SHA-256: 6feee04efd9eb95056644c4c82800edc3b1fc0a535a9d69bc8c83983c4256f7f
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10632 bytes
SHA-256: bceddcf1864566a1ba910fee787ff769d48e3d953627ca088ce5ad3ea4580b50
font_02_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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