Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28d209b0bf8e3cd…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 09:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9196b06ff06427b85d3674945b9ba0d SHA-1: 9aeb6d93f409cfa235919d4a2615ff0db7fbb901 SHA-256: c28d209b0bf8e3cd8e51cf06a7c3e916b578c3f054cb53f470f599ddced59b60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/wix?keyword=cloud+sandra+cisneros+theme PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5fc6d6ea36461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_60010292243a4.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/98de376fbe94.pdfIn PDF document text
    • https://figinesixixe.weebly.com/uploads/1/3/3/9/133999389/pagetenid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_60460dd99d60b.pdfIn PDF document text
    • http://itravelgr.com/69212935895uncdf.pdfIn PDF document text
    • https://lideteli.weebly.com/uploads/1/3/0/7/130775407/1174084.pdfIn PDF document text
    • http://samewejasaka.iblogger.org/56011334016.pdfIn PDF document text
    • http://ruzeviliv.iblogger.org/excelsior_springs_hospital_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495846/normal_5fc721bba5f62.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/dimowijubo-nokaku-dojaviguki-raxigetobi.pdfIn PDF document text
    • http://ogranicbio.fun/tulekejibokizatekuvox21x09.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/todovusejuxusa-rowojesisidijon-siradojiduwu-vemanorezege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5fed453bba1ba.pdfIn PDF document text
    • http://reabook.online/fetajedox45rtb.pdfIn PDF document text
    • http://itdiscount.pro/parallel_sentence_structure_checker95yhs.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/837cab31-f7d0-4058-8d3f-d2eaf1995991/pevaxoxavuxonuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee68bccd-66dc-4e96-9fa9-d89cc93da6bf/fijowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a58411-ddf5-4633-849e-11701595463f/10085592986.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/how_to_get_bulk_writing_work.pdfIn PDF document text
    • http://nabunuwo.epizy.com/8691818252.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/address_label_template_avery_5960.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/40853580931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec623a19-b483-415d-8c0e-f638d5cc5045/13563325371.pdfIn PDF document text
    • http://mofikasim.epizy.com/metformin_xr_vs_metformin_dosage.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/49938390734.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/xakawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed7ac02-af58-4d79-af9b-e376477a4608/maxipizafifaba.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_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 5084 bytes
SHA-256: 08a74bb0ab0ca8179cb734a03a5845c81d6771e3912d7f36285782387aabb777
font_02_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 11108 bytes
SHA-256: b2c494df375f6ae89285f3eb9a9b1b143fb26dde66a668daccb263c32b740ce4