Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf81eb79edfc1d0…

MALICIOUS

PDF

91.2 KB Created: 2021-05-14 13:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bd77aed3d6e3b992e3dc1288fd1824d8 SHA-1: 10c5eb4c3cbb1761f57d6fe6244e87b7509bfe88 SHA-256: aaf81eb79edfc1d02abe850e441f2d004b2333050cb00d04394a48028734c151
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9980

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
  • 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://soxebez.ru/strik?utm_term=my+world+history+textbook+7th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376858/normal_6037986724f44.pdfIn PDF document text
    • http://kamaz-ftc.com/7797825097556llf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_602864ac7e5cf.pdfIn PDF document text
    • http://subakegewoje.sportsontheweb.net/vodoxadixoraganosoz.pdfIn PDF document text
    • http://perevozka.ru/how_to_play_usb_on_jvc_tv_without_remoteh8fou.pdfIn PDF document text
    • http://wiregabjuk.fun/armando_hoyos_diccionario5dlz3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5feb461441d80.pdfIn PDF document text
    • http://retys.space/mememugodixajix9edi.pdfIn PDF document text
    • http://madewithsunshine.com/xoxuzuvurouotsd.pdfIn PDF document text
    • http://tajuliwelofiti.medianewsonline.com/dapupaladuwa.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/indefinite_integral_ex_cos_x.pdfIn PDF document text
    • http://zujewap.mygamesonline.org/dutawixom.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/wenusubajexejug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_60121b136a9ec.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/0e10a833-c1f3-450b-83b2-f4be1016f860/24160978605.pdfIn PDF document text
    • http://farujage.epizy.com/99999462942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fdd956a-480e-4fe0-84f8-24828366df8d/best_tippmann_a5_barrel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ea7ed4-f7b4-476d-81ad-3929a53d9295/jagonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f96cc52-ec8b-4006-b140-8adb8a7b713d/vaxefobip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe0bbdf-e298-41f4-908f-364fc6716fc0/java_basic_game_programming_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3d39c5-ea5c-4465-8e2d-b81057746dba/1960s_dc_comics_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1a73d5-d1fb-45bf-b916-99429df6964e/vobetawad.pdfIn PDF document text
    • http://xokopaxitake.rf.gd/genesis_chapter_6_summary.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 3172 bytes
SHA-256: 92d88506591b6ec1a1b435c8eabc8a9504d2c0eb77d9b1f0520357c17e34e3ad
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 5636 bytes
SHA-256: ed940eee27745fd7cbc95dd2012727f4280e2768334c858f24f0fe10082b3896
font_02_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 6300 bytes
SHA-256: 72147fad7dcdc687805d5c22e2ba502c00291e525f032a573871f28fe93af07e
font_03_sfnt_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 14400 bytes
SHA-256: 686651afa57c44052a87ad20e216f07515f01c7647dbad077a6a4a966afbe0eb
font_04_sfnt_off0001478f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478F 16516 bytes
SHA-256: 79c4ab61da0653a9bc0ee3926ac43642ad74379556c1ce16b2037f5ee8938204