Malicious PDF — malware analysis report

Static analysis result for SHA-256 4931911c7660695c…

MALICIOUS

PDF

79.4 KB Created: 2021-05-03 06:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8d6b2e854dc67832b17be5918d55e082 SHA-1: 0499fb68b800ce2333a66c6835f792729eba87bd SHA-256: 4931911c7660695cd2973d34d6785dbf97acb7a45874399d6264fb364263846a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed to distribute SEO-optimized PDF files. The primary malicious URL, https://golowaki.ru/strik?utm_term=top+down+network+design+architecture, suggests a lure related to network design architecture. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a malicious intent to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=top+down+network+design+architecture PDF link annotation
    • https://bixixadapi.weebly.com/uploads/1/3/5/3/135321875/0b3168695a636d4.pdfIn PDF document text
    • http://zikajewuz.22web.org/asus_crosshair_iv_formula_memory_support_list.pdfIn PDF document text
    • https://vesanalu.weebly.com/uploads/1/3/1/4/131482823/183a2487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_605c6840140b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_601eee14ddae4.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/5192307.pdfIn PDF document text
    • http://watulexop.iblogger.org/bsc_nursing_3rd_year_syllabus_mpmsu.pdfIn PDF document text
    • https://durewipi.weebly.com/uploads/1/3/5/3/135301904/saxevixawubu-lavepa-pafituwevekamam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5fc69f4c9979e.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/gapuruxumeg/rozaso.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/damulitidaruzesawazivolu.pdfIn PDF document text
    • http://xiditad.rf.gd/gasizuku.pdfIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_1f269040c7ac41028e4eb5722d0b445f.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_24c0a482385c4ab09c9292be4262d61d.pdf?index=trueIn PDF document text
    • http://wilafavibu.rf.gd/katulaluxowaw.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/will_cyberpunk_be_available_on_ps4_again.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/38732788070.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_35631b28d76e47ac858630ce077c7c33.pdf?index=trueIn PDF document text
    • https://e41bb7a9-a35b-4578-ac27-1eab720d379a.filesusr.com/ugd/8912ce_fea21c21eca544709f9f7efe1a5ddc8e.pdf?index=trueIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_1c70b55f6c70492d8e806217f5f75e8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/automata_theory_tutorialspoint.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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 5288 bytes
SHA-256: 3c53ba36542e42c46de1df35e60b6b2e6858398fa6f8d8d4f1fc7df19eef5172
font_01_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 11288 bytes
SHA-256: 6e1fc2460aa5042e457aad03d38aef7a96338e81045220cf56eafddee2e09275
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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