Malicious PDF — malware analysis report

Static analysis result for SHA-256 84007a314108770c…

MALICIOUS

PDF

76.1 KB Created: 2021-02-13 22:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0bd1d2d0b0169b28ed308c811fbd2ec2 SHA-1: 2e47916d7994e813f598ef8fdba1e253e1de892b SHA-256: 84007a314108770cb762acd8baa965f032f845def437832caec2945f470c6f61
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or scam campaign, evidenced by numerous embedded links pointing to redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF structure, which includes a link farm, supports the conclusion that this file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=bolted+connection+spreadsheet In PDF document text
    • https://cdn.sqhk.co/duponetix/i4rnd8f/ulzzang_boy_red_aesthetic.pdfIn PDF document text
    • http://izzzaaa.space/memorandum_of_understanding_template_between_two_partiesh8kdz.pdfIn PDF document text
    • https://bukudemedu.weebly.com/uploads/1/3/1/4/131483547/1507665.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/gesjcJE/dejuputif.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/tqjh6ii/west_lawn_umc_bulletins.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/jjdjaRV/nabovit.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/724a82.pdfIn PDF document text
    • https://subusigigug.weebly.com/uploads/1/3/5/3/135316146/fizegulojoxu_wovebozumejes_xejatatanow_dosutezuviv.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/shiHWK8/39096939842.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/e6CXnjf/dunupafiku.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/bR3CU3Y/tiny_archers_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vovidonob/dpKjagd/download_hd_cartoon_wallpapers_for_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/dhhifxY/fever_basketball_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemijeranokawu.epizy.com/hotel_front_desk_job_description_template.pdfIn PDF document text
    • http://gawuvuv.epizy.com/17956094238.pdfIn PDF document text
    • http://vinetewexe.epizy.com/kolin.pdfIn PDF document text
    • http://rebopugosive.rf.gd/byron_katie_books.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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 3016 bytes
SHA-256: 433a5972481a131c57412bcb136329f3bb333da11802b9fad332bb313367dfb6
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 5212 bytes
SHA-256: 7ecdbf010dbdca8d7fc32028715138f3bd5f1b648a6654aa9b35c7c99b1106fb
font_02_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 11300 bytes
SHA-256: cd21274a0e3b7d0ca6479be3026b0f913f2f1e904e4d0203158b0bd890f1f86a

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