Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f38def08801fec…

MALICIOUS

PDF

109.7 KB Created: 2021-04-06 07:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f4c56ef5952f98035b4d0e1a4276031c SHA-1: 16b4cf08d445b43dd3aecf57c9ee39daa1c22aa2 SHA-256: e4f38def08801fec7805736d5264a1cbb1e0a3cff96579ba923db452789daa2e
244 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 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 0.9967

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
  • 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://yafferge.ru/award?keyword=punjabi+urdu+dictionary+pdf+download In PDF document text
    • http://peramabejakes.sportsontheweb.net/boat_origami_instructions.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/journal_of_occupational_health_psychology_articles.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/mugifoj_tonaxulifaj_vejixexuxi.pdfIn PDF document text
    • http://souve.me/6240574621uqati.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/xegeranebevesu.pdfIn PDF document text
    • https://teraxawazolazov.weebly.com/uploads/1/3/4/3/134386914/af87048f4.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/oedipus_rex_full_text_in_urdu.pdfIn PDF document text
    • http://avit0.cc/98448478780n7vb5.pdfIn PDF document text
    • https://vukuxonujifated.weebly.com/uploads/1/3/1/1/131164545/d81cb25.pdfIn PDF document text
    • http://pedalini.club/android_calligraphy_388j1e.pdfIn PDF document text
    • https://roderisagewap.weebly.com/uploads/1/3/4/5/134507489/xuzigagazetorabef.pdfIn PDF document text
    • https://wobosiwax.weebly.com/uploads/1/3/1/6/131607505/burukanewo.pdfIn PDF document text
    • http://blockhcain.host/phonegap_camera_example1cx0g.pdfIn PDF document text
    • http://liolika-rsya.ru/espn_nfl_auction_draft_cheat_sheeto8bqv.pdfIn PDF document text
    • https://muwalarole.weebly.com/uploads/1/3/5/9/135959937/6cf4adf7d54f.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/b2a707dac4298.pdfIn PDF document text
    • https://gefogujuper.weebly.com/uploads/1/3/4/0/134012332/bibuxikozig.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/mit_computer_science_reading_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fae44d2a-8e08-4093-8f4f-041e862fe10b/61578034822.pdfIn PDF document text
    • http://zaximibirada.epizy.com/revista_o_boticario_ciclo_08_2020.pdfIn PDF document text
    • http://mujedofagogi.epizy.com/how_to_draw_out_blackheads_on_cheeks.pdfIn PDF document text
    • http://dipuleragix.onlinewebshop.net/modadoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b7a992-48e4-4048-81f2-200680539618/lord_i_need_your_grace_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3bb97a-42b9-489d-9974-eeebd47869b1/gifomuvunobusupeduzar.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015eee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15EEE 32724 bytes
SHA-256: f003e6e7d4d5e6f48daa2b776e880d6ae2e970bcd412588664fe7a538bd4849f
font_00_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 5144 bytes
SHA-256: 44805d2ca53dc0eab31c945c6b8aca82f8f70dca90489f1f356b8c3a7674a31f
font_01_sfnt_off00012cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF0 3620 bytes
SHA-256: 60eb58b134b4f7287ee7156a81fc2424aa361841ab355e7ccb2bcfd2c86dd646
font_02_sfnt_off00013b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 10280 bytes
SHA-256: 7237c5aaf9ac75a16b4f15dfc489070e5a9e4556b4a3c8de99827863676e01fe
font_04_sfnt_off0001979d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1979D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3