Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb579515bfaa46d9…

MALICIOUS

PDF

71.5 KB Created: 2021-04-03 18:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1bd13dafdf4042a096dc9c06878524bb SHA-1: 22e50474e2492799502a32246cfafa9708a23672 SHA-256: cb579515bfaa46d93bdccce9a41c1a3e189ea5e223a6f71c38c4a2d57088d9ab
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=grammaire+fran%25C3%25A7ais+niveau+b2 PDF link annotation
    • https://cdn.sqhk.co/dokukavifig/hJgjdgc/trace_call_details_of_any_mobile_number.pdfIn PDF document text
    • http://aydym.club/you_are_my_world_quotes_in_hindi0i3of.pdfIn PDF document text
    • http://mebelintera.ru/chicago_blackhawks_news_bleacher_report5ap6j.pdfIn PDF document text
    • http://mybestchan.online/how_to_apply_vehicle_stickersqrzlh.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/free_home_inventory_list_templatebg2e3.pdfIn PDF document text
    • https://cdn.sqhk.co/koluvukirate/geipieN/37101584768.pdfIn PDF document text
    • http://securityverifiedservices.com/how_to_make_a_maxi_dress_without_sewing7uh0q.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/example_of_a_written_research_proposal_in_education4rd64.pdfIn PDF document text
    • http://shopyou.online/cartas_illuminati_traducidas_al_espaC3B1olsaxx5.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/406190799206gsvg.pdfIn PDF document text
    • http://uscreditmonitoring.info/pelekatifutofzjay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_e8dcc9134b3442239b6c8bc9aed692aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c165be8e-d9d3-47ca-bcf3-11e0a908f598/57428854088.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_8bc33e1671b84ac980168f7bc7cf5300.pdf?index=trueIn PDF document text
    • https://86cafecd-0af7-43e6-b578-14605c742a6c.filesusr.com/ugd/c4ddd0_e3f36cbfa7684e3da10a2f45bf8969b0.pdf?index=trueIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_f3f84746d67f43afbe602eecf58b34c4.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_709f398a307c4382bd3ed942210ad9a7.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_d43e577e4e7f408e97521543a39989ea.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_9b4d5ba1f91947e8bb0675b90323cca2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a4b3a2-d448-4887-bbb5-3c47badfb409/how_to_check_voicemail_on_my_vtech_cordless_phone.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_aa36065569684fd6920d70a424bfcc6b.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_3b6c5fbfd62544a3ad39d47e44e561c7.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_28e5f924a0af46868b1b3068e8b70e52.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 5424 bytes
SHA-256: c3803629baf93e5aabea5e0da63c04c250164ef4f2f8efaa6b8aa239dd3d212f
font_01_sfnt_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 11844 bytes
SHA-256: 85f9faa99755df9d8f93313dcaf180ec900349ef0bab92b061f7c13c421b7b94