Malicious PDF — malware analysis report

Static analysis result for SHA-256 755ce6f0270cfff0…

MALICIOUS

PDF

70.8 KB Created: 2020-11-28 21:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9da7adca2dc211a8c29f0222b194ae78 SHA-1: 1bc9f201f4c225d1e0fa40361427f785077fb16b SHA-256: 755ce6f0270cfff0501c8117674335be9c63fac20a8377fe53895e0140f452be
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The primary external URI points to a URL that appears to be part of a campaign to drive traffic to potentially malicious websites. While no scripts were explicitly extracted, the presence of numerous PDF links and the overall heuristic firings suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://traffnew.ru/aws?utm_term=isotopes+and+nuclear+chemistry+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f9cfe87c93d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f87586092f5a.pdfIn PDF document text
    • https://mejotumuv.weebly.com/uploads/1/3/4/6/134636951/e4fb32bfd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f86f428c51be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5fc1f09f72948.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/d0e2062f850e4.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/vukuwevakura.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://s3.amazonaws.com/topipovikapari/avazzia_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/unblocked_fun_games_weebly.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/bogaw.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_off0000c551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC551 5388 bytes
SHA-256: 3f7746a6f660444f3a51699166f7bc79a7fdca971dd5901a4ba28947dfb6e87b
font_01_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 12356 bytes
SHA-256: cf832701ab2db4b735e18444ce5a488166087d468f83bd8cda23f72538746292
font_02_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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