Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12ba1f24ed0d158…

MALICIOUS

PDF

84.9 KB Created: 2021-06-01 05:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dab760f854453f1051c30667813a009 SHA-1: b9f09916ac28105c20cf2ddc45691c7c96bed33b SHA-256: a12ba1f24ed0d1589113d3469499b6317fb9aa6483729ebc7cb1b9ee3caa1eb9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://crysiq.ru/pbw?utm_term=sylvia+plath+ariel+poems+pdf', is particularly suspicious and likely serves as a lure or entry point for further malicious activity. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/pbw?utm_term=sylvia+plath+ariel+poems+pdf
    • https://wufezaju.weebly.com/uploads/1/3/0/7/130738917/tatitevebol.pdf
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fdbb72add6c6.pdf
    • https://cdn-cms.f-static.net/uploads/4494146/normal_60657e6ad9397.pdf
    • https://nojuguxupibubir.weebly.com/uploads/1/3/1/4/131438610/8119398.pdf
    • https://kubamugikogili.weebly.com/uploads/1/3/4/5/134508843/jejomanusenita.pdf
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/wafuxixeserizopaziv.pdf
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5ffdeedf94cf3.pdf
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/lowoboro.pdf
    • https://vijaraxuvebuko.weebly.com/uploads/1/3/4/8/134895366/nivebibeviwuxigu.pdf
    • https://munulokepopat.weebly.com/uploads/1/3/5/2/135297381/pegaki-gejalabedi-nonadamovewudej-biteferab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b157bbcb-56ee-48cd-b9cc-56d616ca0471/wusedafe.pdf
    • https://uploads.strikinglycdn.com/files/a72edebb-ca7a-4ac5-96e3-e63144735ef3/15802910899.pdf
    • http://foziwedugumu.pbworks.com/w/file/fetch/144435054/pijinos.pdf
    • https://uploads.strikinglycdn.com/files/da3ef0ec-66f8-42e1-8a2d-12b9633603f3/25429555995.pdf
    • https://uploads.strikinglycdn.com/files/f26dc201-99dd-43e0-bfe7-c0e8dfe17234/before_you_say_i_do_workbook.pdf
    • https://uploads.strikinglycdn.com/files/16d12d83-8acf-4279-9da6-9ae50ed42154/silusakirubagefe.pdf
    • https://uploads.strikinglycdn.com/files/d462d8bc-eb08-4065-bf7a-10decbc2d256/kekurutuwojet.pdf
    • http://paderukut.pbworks.com/w/file/fetch/144433926/white_rodgers_thermostat_1f86-344_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/67616eb7-024f-4b23-a367-fa1e92214950/marine_corps_training_plan.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_off00010e37.bin
54da5a58c8a73fbf4c815d315a8bd5c1550f5af1f1f581d6e1992be1a5fcae49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 5544 bytes
font_01_sfnt_off000120f7.bin
91e59a5cecdf196824c494e04168e5e746ee7f02271137b2cfdba9e29845dfe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 10972 bytes

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