Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4a8c8e4cbf3b93…

MALICIOUS

PDF

79.0 KB Created: 2021-03-29 17:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 87696c7b34599af1294808661d1c178a SHA-1: c0992bde37bb98ae957411c586d3e87e1d5dece1 SHA-256: ee4a8c8e4cbf3b93ef4bb7315dd909463e8769bac11dc5e59a9b6eb0f8606b08
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://golowaki.ru/strik?utm_term=how+to+get+into+my+motorola+modem PDF link annotation
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/mujabedufafalos.pdfIn PDF document text
    • http://reabook.online/brazil_economy_2019mgsky.pdfIn PDF document text
    • https://bafokaxaxex.weebly.com/uploads/1/3/4/8/134881351/5120891.pdfIn PDF document text
    • http://onsideball.info/smtp_mail_tester6p9aq.pdfIn PDF document text
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/memexofebarowa_xuradifaj_vorevininufar_gadudaxim.pdfIn PDF document text
    • http://boldly-grow.com/diwixodokewivisemaxepm26bq.pdfIn PDF document text
    • http://jobauthor.online/are_taco_bell_beans_bad_for_youd5v7d.pdfIn PDF document text
    • https://gokebapin.weebly.com/uploads/1/3/5/3/135320588/dimodiberelowo-dikoxilaruka-pudaxalonumof.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
    • http://lepefefila.epizy.com/77252324658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007c14ca-d085-4898-a021-69c96ec42cd6/firex_carbon_monoxide_alarm_beeping.pdfIn PDF document text
    • http://linewezidewixa.rf.gd/besewabajaj.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/gerund_as_subject_and_object_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/5181763221.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/murorijageno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7973bc1-c8d9-45b8-a2d2-a2919b127891/langston_hughes_poem_harlem_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/37438295854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3548848-0793-4aee-a413-021fb43c7ab2/pizozusewogono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1739eb23-ce12-4454-a3a1-c2e6508f7145/taller_de_escritores_2nd_edition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/evolve_hipaa_training_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59cbacaf-37b0-43b8-8736-a6dcebbe736f/65076355216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0a9128-b5a2-4d9c-949f-61f9e95c6139/sda_bible_commentary_genesis_to_revelation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f41ece-94fd-475a-8ea2-1f132bfbbd17/nalopos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c1ba2d6-5827-4965-bb5e-60bc6f56a215/how_do_you_calculate_a_15_tip.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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 4912 bytes
SHA-256: 7cd1bdfa7a8e1a099828c4dd8f752cebe630431b4a954faab27f9f26936e9177
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10684 bytes
SHA-256: b600b5af6654e09f633dab3c7e1478622663222f859ddc5c3d0e0d64f7da38eb
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333