Malicious PDF — malware analysis report

Static analysis result for SHA-256 3476305c309f1039…

MALICIOUS

PDF

81.1 KB Created: 2021-06-14 00:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 713c8bbff0c72cf97f5c1771ebe5c5e7 SHA-1: 0b5e5ab2559f44f54b9d06bdef71d9c00e277ef2 SHA-256: 3476305c309f103913c1852596103eb6c822ebc50cb3dbda4877662fd8447bdb
186 Risk Score

Malware Insights

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

The PDF contains a large 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. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://catamma.ru/pbw?utm_term=atlas+copco+air+compressor+fault+codes PDF link annotation
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/bafegevev_mafota_kigepukevixu_minoperoxikaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_601fb8f2dd555.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/796a2e49600d340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_60c5d499bbac1.pdfIn PDF document text
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/gexarag.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/kidaj_rojegisuzitalo_rigeji.pdfIn PDF document text
    • https://rizaxulizogi.weebly.com/uploads/1/3/4/7/134753796/fusidojosa_kubona_jozamat.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://buvavipoluvu.pbworks.com/w/file/fetch/144573843/46395051400.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/w/file/fetch/144580320/transferencia_de_calor_por_radiacion_concepto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e65431a-9c03-4ad2-b7f0-1752c790cdd9/tiktok_app_free_download_for_windows_phone.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/korean_novels_in_hangul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5d8b70-d8fe-4719-b42c-c5327bede65d/46924553978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa784f1-df0e-47d7-85f8-12724e1439ec/dna_profile_webquest_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0f2ee8-14c4-4ed5-b7ca-b35c506e3330/how_to_find_cost_function_given_production_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1868fc1b-0f82-43fe-a5cb-443d41decd15/toshiba_led_blink_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb370584-7529-4d52-9fcb-a8e93f85c4e6/casio_pro_trek_3443_manual.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/f/zapar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d834e2-acd8-4c07-99a9-53daceb1de77/fulavogenorapozemuluta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4266af73-9a46-4caf-a31d-3d300dcf653e/27007583683.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/f/biology_neet_question_paper_2019.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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 5064 bytes
SHA-256: ba7278af63b6a0f3bd444025d31a2f746f356452ad179893c9c84ee2294f13d2
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 11132 bytes
SHA-256: a4527fbc92d397772e574ffdceb0a01bb844bdcd184fc51012a121565cf0a992
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e