Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8fbe1df220f5c5…

MALICIOUS

PDF

93.7 KB Created: 2021-03-21 07:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 49f11f44c6dcf46633d732cbc2f04254 SHA-1: 91464dc584d276cbf5e1f2771d395b033a3f4b95 SHA-256: 5f8fbe1df220f5c5c68863f3d68db5893c6ac271f4fe5b6de25b83cbc56c6aee
186 Risk Score

Malware Insights

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

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 0.9991

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://seumenha.ru/strik?utm_term=kansas+carry+on+wayward+son+lyrics+greek PDF link annotation
    • http://getallcreditscores.info/lufutemudavarozewx4it0.pdfIn PDF document text
    • http://cancandance.org/the_beatles_let_it_be_sessionso0nki.pdfIn PDF document text
    • https://femesavez.weebly.com/uploads/1/3/1/3/131383434/giwukuwovod.pdfIn PDF document text
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/6ce2e4.pdfIn PDF document text
    • http://amst-watch-v1.club/spillman_cad_user_manualcqdn5.pdfIn PDF document text
    • https://zofitete.weebly.com/uploads/1/3/2/7/132740948/mofarek_mowogazu.pdfIn PDF document text
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/wesisikeka-borafid.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/dibafodogekasixomokekifar.pdfIn PDF document text
    • http://vostokzapad.su/gumopikumolubifitegikikih3g5.pdfIn PDF document text
    • https://gewujezugiwo.weebly.com/uploads/1/3/4/7/134754524/posowule_wigazufabiji_mosetaxal_wexerikep.pdfIn PDF document text
    • http://eglo.club/311702785833mb2r.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/zidiwamifitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_7860087e884444ec8474680119f3f353.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da02155d-42b2-4884-84b6-932329b60a1a/marketing_management_average_salary_uk.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_dc5521c5f9d34839abd843092a734e96.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_399c55f7fc1344c589f137d0d4567df8.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_efee4ce9d6d64e21a9592988e67486dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ebc75b-61de-48be-b87f-34dc6b2c9eee/what_type_of_charger_does_a_kindle_take.pdfIn PDF document text
    • http://zevusup.atwebpages.com/jorijejezeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1647785f-dac7-4824-a8ba-bc1b7b0cb350/the_compound_effect_book_barnes_and_noble.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_45748eeb12e4473491f849fab87eeef1.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_6494ae80fdfd4489885b46bf77aca8b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81bc323-d50d-42db-9ec5-88973a874220/bigegarupixuwewejazug.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/pebozapez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c26cb6-5c8b-4745-8c26-438b46c5bcd4/object_oriented_programming_java_beginners.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001323b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323B 5336 bytes
SHA-256: c5da036ecd9408d34fb6538419475887e527002f6fba7eaa19a6fd29fe4579b0
font_01_sfnt_off00014488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14488 10780 bytes
SHA-256: d226f590b2c883e7673df4da2ed1602dfa61aa1d77033f89f55836a801f96e78