Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e9de98056de610…

MALICIOUS

PDF

81.5 KB Created: 2020-12-05 17:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 957fdd9d641c9b06db40ff464c986415 SHA-1: 18853a5a2c0c93462a1e01d3756ed495b9c38554 SHA-256: 45e9de98056de610eeb2074734ab91943f7bae04a41e9c432640652b88faad3c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains a large number of external links, many of which point to Weebly domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to 'Umass amherst athletics division', likely a lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate a phishing or malicious content delivery attempt.

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://trafficel.ru/123?utm_term=umass+amherst+athletics+division PDF link annotation
    • https://mogewojelepa.weebly.com/uploads/1/3/4/6/134681452/508312.pdfIn PDF document text
    • https://sunawakajisume.weebly.com/uploads/1/3/4/3/134324988/rumixopul_wisorul_jelogaguwudeke_wifexad.pdfIn PDF document text
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/1871542.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/8517355.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://static1.squarespace.com/static/5fc0f73d1c8c741314321d77/t/5fc4ece0fa04221c71ba3ce2/1606741217346/muvomisu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3c939bd14ff0dd2ae97c9/t/5fc515261972c46e3c3edb2f/1606751526976/rpg_maker_android_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8dc7fd-3c7f-45d5-aa91-9caf96a74254/designated_survivor_sasha_booker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379667a5-cfb7-43e3-9c45-fb751c2e8af4/muwexudaraxakapulonap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd889de9-b513-4472-8482-33387d03f25b/depokolamumulapiwikis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdbd902-3b60-4312-9537-81afbd15a92b/deep_river_shusaku_endo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29c1b8787e8798976ec1d/t/5fc9d8f5e4017829c16c6853/1607063799376/bomideja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9321993-ad79-4d2f-a081-2798ca86d72d/qdc_burger_montreal.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_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 5016 bytes
SHA-256: 005c0c078bfabb8824dfb24cbc7efc56b2479c0046d95492d8fac01135ae3a0b
font_01_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 11196 bytes
SHA-256: 085466cee5833f9e66ff6af6dfd691b7c2d51763957174cee27d66b3f3a0eb00
font_02_sfnt_off00012b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B07 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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