Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc739048b7b8abff…

MALICIOUS

PDF

78.3 KB Created: 2021-03-08 04:08:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8243d97d7cf65b1646b5df81f69769cc SHA-1: 76a51803adaa5bb8213f2b8c9efeff652f550677 SHA-256: dc739048b7b8abffb44fc2cd8b935dadebc174e71b2dc8c9cd01b859f6227ddc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link leading to 'bologen.ru' disguised as information about activating a Verizon hotspot. This suggests a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, many pointing to S3 buckets, which is a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://bologen.ru/aws?utm_term=how+to+activate+verizon+wireless+hotspot PDF link annotation
    • http://warowusavi.mywebcommunity.org/jeep_cherokee_maintenance_schedule_2016.pdfIn PDF document text
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/c1f871a.pdfIn PDF document text
    • https://pizosamijuge.weebly.com/uploads/1/3/4/3/134348406/8097082.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/609867.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/kamoxomufogosiwevix.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/xepuduf-bexutonowu.pdfIn PDF document text
    • https://lujuvikib.weebly.com/uploads/1/3/1/4/131406806/8869294.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/vajifidumozifibosuzojeno.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/lizuseguwix/store_receipt_voucher_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/sobulexuziluderezi.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/difupugamemaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8fa2ff-add8-4957-9812-7ecaac1699bd/99440226032.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/21223079941.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/97353482661.pdfIn PDF document text
    • http://ferodibev.onlinewebshop.net/tapitigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a12c4da-7f8e-4ed7-987b-de8d90fa71cc/61894171379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483f430e-ffc7-49dd-8f56-e55faa7750d1/best_lifting_program_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0faf991d-bd88-4432-83fb-e9912643c280/komusenufufudisawirul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37fd2390-85dd-48d7-9bff-b60736835795/tcp_ip_protocol_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60be3286-4748-46e6-9b36-69c258dfe4a3/is_tanzania_a_visa_free_country_to_nigeria.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/what_is_a_group_theory.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_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 4972 bytes
SHA-256: 9e95e76b0c4e8e0dfe5c6b35d39e837a1f6570e50b501c1b9b8dba4004e07561
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10908 bytes
SHA-256: e19bd79e435ccccd3aed265aa1d9f385d0d0a40cfe3fb85efb0776ba11cbd1b7
font_02_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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