Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a645db9a47f9e9f…

MALICIOUS

PDF

90.7 KB Created: 2021-06-08 09:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 67b6b3cfbfa0021fba7bee048bcd4e0e SHA-1: ca1411e31e67e98981b17ead70e8450264cbbf18 SHA-256: 7a645db9a47f9e9f8af576085c5a5cfb4d1e481ac7f46a9e642fa8972db38373
164 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating an attempt to host numerous external PDF files. It also includes an external URI pointing to a URL that appears to be part of this scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+download+english+grammar+book+for+competitive+exams PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486965/normal_5fdd9e5e89ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_600b627000fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_60be972105579.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/fanuronureza.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/8733042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479921/normal_5ff1ada892e1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486374/normal_600898eda2727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446174/normal_60029fbf8e204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5fe6192042023.pdfIn PDF document text
    • https://xotukejurivaj.weebly.com/uploads/1/3/4/0/134016857/2c8fb751d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_6043ee245b457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_600ec4e65c17b.pdfIn PDF document text
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/8009976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_60462c54aa010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c32056-0701-4cdc-aed4-16bc56f328c6/bivatitotupiwelexapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf466002-7f0c-489c-ac47-b70ab02002e1/gomilobufaxogexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c102a4cf-9c37-4890-92cd-92a4155937d3/14071913380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f2af00-1477-48fa-9d34-8cd990999e6c/printable_fortune_cookie_sayings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcf69f0-01aa-428f-b382-82ac7052b27a/rabuwajimapakidukediribe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211a6327-74ef-4117-bf2f-a4e838fd0a86/butler_county_ohio_police_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35890a0-5eef-4037-ab80-2a8a47bb8fd7/a_discovery_of_witches_season_2_episode_1_in_canada.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_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 5948 bytes
SHA-256: a802a5554a7c51cf536f42e104bbbc1a3191e6e8e989dc7a0a9c09857cd4bfdf
font_01_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 13572 bytes
SHA-256: a4d6c2db5d4c86ca0c91e93f7f2a43ca031b2ab44bdbc4ecbf72fc1e559f1267

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