Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a7eec792bc68b8…

MALICIOUS

PDF

73.8 KB Created: 2021-03-31 09:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d58882a49ce3c6ec655cfbb2baa6f33d SHA-1: 91e0b68be6d43d67a99928c4aa08b732a9e72c22 SHA-256: a6a7eec792bc68b8b7aa232dc42079821f1dbc5090a23afcb68f08912713283e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wallpaper hd pc', suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/123?utm_term=wallpaper+hd+pc PDF link annotation
    • https://rafodazav.weebly.com/uploads/1/3/5/9/135963082/3495756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450248/normal_5fc7d290daec7.pdfIn PDF document text
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/dumovoxadubejapakuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426545/normal_5fc5d8622fe61.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/6820327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410962/normal_60052e2594be2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_602c5841797cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_604fc6b613dc6.pdfIn PDF document text
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/xebiweme-paputisumavav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449776/normal_5fe2e1f5bc752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393637/normal_5ffccc3ad9558.pdfIn PDF document text
    • https://didosetugub.weebly.com/uploads/1/3/1/6/131606008/1950000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485012/normal_60030c662d59f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fc56d0a6f1bb.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/vapelurowar/65974729921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9f68d0-14a9-45b6-bfc0-cc53336b3a83/mizejakilutuxativi.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/what_does_just_a_question_mark_mean_in_texting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2070273-7a4b-4637-adc7-b302e9731274/level_capacity_demand_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28691294-bd0d-44f3-bf38-720222d72f82/nimubigeb.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/harlan_county_reservoir_fishing_report_2019.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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 4996 bytes
SHA-256: 6920072e4ed689e7d9ca8cc3b6fbebd79ee3ddb4f7f754be50a97f6e971d8a49
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 10544 bytes
SHA-256: f56bb7eb32c8131ed92e74c3e982375f27ae86dead3bce00832059e449cee82f

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