Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d758b00e6a7687b…

MALICIOUS

PDF

73.8 KB Created: 2021-06-10 08:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5abf3f1b8bc280661ee1ebefdf50551b SHA-1: aa2f1b34f617bb26643b67a47299838537d904f6 SHA-256: 0d758b00e6a7687b554c8de3d70ed45a516a9102fa2a1923b5d0867cdcc7af73
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with a primary URL pointing to a suspicious domain. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=pubg+mobile+obb+file+highly+compressed
    • https://cdn-cms.f-static.net/uploads/4408177/normal_6059111920615.pdf
    • https://static.s123-cdn-static.com/uploads/4470521/normal_5fe0e5228453b.pdf
    • https://dujeranisijoku.weebly.com/uploads/1/3/0/7/130776063/9548836.pdf
    • https://jivafizet.weebly.com/uploads/1/3/4/7/134743279/vaperoge.pdf
    • https://sepoxoritafide.weebly.com/uploads/1/3/1/4/131438330/kegufirez.pdf
    • https://pesimavadedeto.weebly.com/uploads/1/3/4/7/134729205/zajixe.pdf
    • https://napolodakuziman.weebly.com/uploads/1/3/0/7/130775867/vizorirituw.pdf
    • https://logikepuni.weebly.com/uploads/1/3/4/4/134459966/86001.pdf
    • https://cdn-cms.f-static.net/uploads/4407804/normal_603e241e8785b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94e03c40-16d9-4a0c-ad96-289cbaad32aa/nomenclatura_quimica_organica_iupac_amidas.pdf
    • https://uploads.strikinglycdn.com/files/3dba585e-b3a5-4fff-babf-0081e9eef96b/xanathars_guide_to_everything_portugues_download.pdf
    • https://uploads.strikinglycdn.com/files/ee6c5d8a-3070-456f-8724-190eafcbcb61/pozasubidox.pdf
    • https://uploads.strikinglycdn.com/files/e361168c-dcdd-4201-b924-6b5e92d915ff/gas_water_heater_installation_cost_nz.pdf
    • http://patuwit.pbworks.com/w/file/fetch/144825915/64201207784.pdf
    • http://barumena.pbworks.com/w/file/fetch/144463959/kokubusopo.pdf
    • http://suwoluran.pbworks.com/f/6926027496.pdf
    • https://uploads.strikinglycdn.com/files/a637126f-5575-4051-9147-329b405301a9/mifoxir.pdf
    • https://uploads.strikinglycdn.com/files/64bda0c5-240a-4f77-827d-2d4e1720d5d0/19837810639.pdf
    • http://kakexigodelo.pbworks.com/w/file/fetch/144575496/9._snf_palme_fizik_konu_anlatm_indir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39a.bin
9f31dbaf9df95a13b685566e7d50d730415e884c4e5f4c5ee45dd95f992f493c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 5604 bytes
font_01_sfnt_off0000f68d.bin
32fa36106e98f7a2dd406753ededadb05719ddd8ee7a888e683c96cfc0b32701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 10276 bytes

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