Malicious PDF — malware analysis report

Static analysis result for SHA-256 4463eda8da9df51b…

MALICIOUS

PDF

90.9 KB Created: 2021-03-13 18:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff36d035d29f6c21a17910b288ecd27a SHA-1: ce357cf2eb97558d87b46a7df525168162f97127 SHA-256: 4463eda8da9df51b3af9e4161cd24f1944b90124d3e9fe829ced01f5b64bfef9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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 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://yafferge.ru/123?utm_term=abdul+karim+soroush+books+pdf In PDF document text
    • http://lazirog.mywebcommunity.org/ejercicios_de_verbos_en_ingles_para_nios.pdfIn PDF document text
    • http://xaraxag.mypressonline.com/gubusogokelasedapuxetunu.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/67720576301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_601addb789d42.pdfIn PDF document text
    • https://cdn.sqhk.co/nujamuxeg/igIHies/kick_the_buddy_pc_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_602f6fcb096f5.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/fewafuzebal.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/golopagax-nitanipigadagoj-dikuwukogor-wemomifudiduk.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/free_business_english_books_in_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_604b34859f7af.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/ifkBgik/entry_level_advertising_jobs_los_angeles.pdfIn PDF document text
    • http://muzotom.22web.org/how_to_add_doc_to_wix_website.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_60058a44e817f.pdfIn PDF document text
    • http://kuvonej.iblogger.org/niximi.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/g2iihgu/fisolodupoluzifavilax.pdfIn PDF document text
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/2ca80ea9e43.pdfIn PDF document text
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/1b99a8a9d8cabb0.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/rofimolug.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/c59b0388-507c-41ac-a110-fd7477863e75/simple_future_tense_worksheets_for_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a0b8d1-a2e5-4c5f-92b1-1832971c59d6/zonurupolome.pdfIn PDF document text
    • http://jaxarafepemu.epizy.com/lagu_aku_mohon_sayangilah_tik_tok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f8f03d-214c-44d7-b18f-ca62591bcf35/tidijegewumiroleparon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c838e9ba-fd13-46a7-a01f-2b327b611608/vixifitiwegaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29355ecd-166e-4a65-80df-27e85913b7e3/jam_marks_vs_rank.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012c2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12C2F 28400 bytes
SHA-256: b1968f9803eea32224f62dcf4f12e4a58d002f8e99064aadb654a3c78bc23f1f
font_00_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 5472 bytes
SHA-256: 5e9131967cdf92e543fffe3cc1818a6923acb4323f25b41f79bcd7a3a526cdae
font_01_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 11752 bytes
SHA-256: a942f36c8e22a0013570763d5f82751779bfcc278b5ef2f3f1c4e0ce5ac7ec07