Malicious PDF — malware analysis report

Static analysis result for SHA-256 73616a56d4c4e4ef…

MALICIOUS

PDF

83.5 KB Created: 2021-06-10 13:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1e77fc4810db168cdb48beb9072d315f SHA-1: 55ba0dc4f6a1730ec2b4c283a9d00609b134ea63 SHA-256: 73616a56d4c4e4ef5ebc224283b126f0632afefb289f51dcf03cfa219f82f4d0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting an attempt to manipulate search results or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://garglob.ru/pbw?utm_term=iphone+firestick+remote PDF link annotation
    • https://wafubimuzev.weebly.com/uploads/1/3/4/8/134869603/galafanagevinakebib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5fcedbd998008.pdfIn PDF document text
    • https://razesune.weebly.com/uploads/1/3/3/9/133986972/4796918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_606107badba54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6051b5a6b1810.pdfIn PDF document text
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/1d2012f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_60bed61a401fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405895/normal_5fec6db13b79d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fde9d545ad36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_605e179779f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5fd7a0845d212.pdfIn PDF document text
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/nubekajodafidixev.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://uploads.strikinglycdn.com/files/35ac8198-b9e9-4d24-8dae-5d12e4a0e88a/didadolupunom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bcf32d-7d5c-4582-aec3-32216447fe88/83905103236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8113a2b-6527-4283-a930-c2a74afb6ef0/64988416866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb947bbb-0eeb-4a59-96a1-4d04db058efa/diwos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b9b683-cfbc-4eeb-8112-94f114f9f0bc/zokegimim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645edf1f-261d-4681-ad5f-b15aea246223/volojufabolakarivob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26125e17-28e1-4b38-a7ed-3dc60bb5f2b6/fisafijologa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291c2a5e-e0d6-4b5e-926f-8738f7065608/92081947429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b4a057-0e21-4e0a-9219-6545688aff83/wubitopuwoxaral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70220bdb-62f0-44fd-a0e0-db08b36c0f72/95707251084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09824505-84ec-4f7c-bc19-387e0526b20f/55912309374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f28b20f-ef5a-4a53-92d6-222a36511cbd/.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 4804 bytes
SHA-256: 448ddd0b919027c3570f87b76a05ebae2eba6c30298cd90decdb2552d7d9521f
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 13020 bytes
SHA-256: ead899171078178772392c8a80feb4cad628c8e7e7d48f93e0adb2d24ad4dd64
font_02_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 16068 bytes
SHA-256: 912e8c3c37b183d760f7f382ef110bdca05c7793b62d2efdd5772423ec248018
font_03_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333