Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c8f87c54c2fe8d…

MALICIOUS

PDF

73.0 KB Created: 2021-05-24 17:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b3caacfef44b982ba3d32e831ff709fa SHA-1: 5c55c3a1b1a1507412953a27250a03dadb093d12 SHA-256: d5c8f87c54c2fe8d7910b377653c1e1555fb30b2d87b314d791bfe09f0459d8b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URL 'https://fokemale.ru/strik?utm_term=scruffs+activity+tracker+watch+instructions' suggests a lure related to product instructions, likely to deceive users into clicking and visiting a potentially harmful site.

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://fokemale.ru/strik?utm_term=scruffs+activity+tracker+watch+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410431/normal_6015023537ea8.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/lorumafanib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_603fd509213db.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/b9487d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_6035868f89d9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374181/normal_5fecc9a5c20a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_60655fd34c9fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_5febcc4663875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_600fd26019a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5fd6394b7c39c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_60112139cd5fb.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/lavug.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/db61e33e-eee3-4550-8e0c-dbd9760ef6d4/good_synonyms_that_start_with_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b4716e8-c874-4a0b-9f1d-5b3ea87afb1c/15683286785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d338c04d-dd2b-4d69-b28e-d42055748531/tulib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec235694-de03-4c30-b456-a406ad38740d/how_to_setup_jabra_engage_75.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7d3a22-8833-47df-af04-6895a3d3d1d8/9714154672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a32e9ba-c14f-453c-aa90-b320f94d00ff/san_francisco_airport_to_santa_rosa_bus_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d0915f-c6d1-40af-8f10-1ce70f86fa4b/ps_vita_trophy_hack_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07661c76-08dd-483d-84c4-9f6f470db4cf/where_can_i_buy_starbucks_travel_mugs_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6898744b-0ee1-43b9-a873-88b727be86b9/vituzixixusebikela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f8b072-8657-4e80-a137-fa514c3cf161/the_great_gatsby_chapter_1_review_questions_and_answers.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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 5720 bytes
SHA-256: 83a2f87bc9f58ff2fd0a08e3f7a8e6d000a88acc148a483bc661a66cdd21efe2
font_01_sfnt_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 5360 bytes
SHA-256: 5718866c9e294757e1158733ae3c582adbbd13f055323cc0dae0350d89a6cfbc
font_02_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 9132 bytes
SHA-256: e630d4d3807cfd66a0f1004404a7c8c0638c1458bc05e79d6a5ae7b9eb49a50a