Malicious PDF — malware analysis report

Static analysis result for SHA-256 803665bc60c49503…

MALICIOUS

PDF

126.6 KB Created: 2021-04-15 20:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e7abd5f9b65af4a3917ba90301401772 SHA-1: 198c3db303340cbd7ac5a726db14ec3f50e960d7 SHA-256: 803665bc60c4950390929bdb830d1cb5d4144098a326d23d56d3453a1490a29d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://midufefew.ru/strik?utm_term=introduction+to+philosophy+classical+and+contemporary+readings+fifth+edition PDF link annotation
    • http://yozi.store/new_tamil_movies_2019_free_tamilrockersq5qku.pdfIn PDF document text
    • http://helpforteam.com/love_breakup_images_in_tamilbe57d.pdfIn PDF document text
    • https://molujeridinu.weebly.com/uploads/1/3/4/4/134400438/4558536.pdfIn PDF document text
    • http://belplitka.ru/kuta_software_infinite_algebra_1_combining_like_terms_worksheet_answersg7u8p.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/bojeganuga_tivimitagi_jezuru.pdfIn PDF document text
    • http://good-production11.site/61097064736i0i0e.pdfIn PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/fa76f3ce9b3e.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/contoh_amdal.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/how_to_clean_mr_coffee_maker_10_cup.pdfIn PDF document text
    • https://pixojewunut.weebly.com/uploads/1/3/2/6/132695451/2119169.pdfIn PDF document text
    • http://euroshopmn.space/31919556011quk8p.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/184edee8-6616-401a-a56d-1a31dcac6c4d/wizard_sewing_machine_models.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/bridge_to_terabithia_play_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e332147b-30ef-4854-9f13-ad1142a389b7/how_to_disassemble_speed_queen_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/63079489908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc94e53-b9b9-455b-9734-2b38f5de5dba/21866108858.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe1cfb3-0e55-4c75-bde7-59771f670be2/the_girl_from_ipanema_astrud_gilberto_joo_gilberto_and_stan_getz_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e7ab08-f9ad-4a6d-b206-9be3a49948de/63218782439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0f7c35-b50a-4119-b03c-29ad33281a4b/vivofit_jr_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d74d4c-9f33-4d70-af49-62e2eb012ab3/tri_tronics_classic_70_g3_transmitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81902042-003a-4142-990d-4d89774b84b6/how_to_control_dc_motor_with_arduino_code.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/brothers_in_arms_acoustic_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0e9351-db2c-436c-93ce-218c79b7a58f/vizio_38-inch_2.0_channel_sound_bar_sb3820-c6.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/date_sheet_aiou_ma_education_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5b7a94-3b5b-4107-bb7a-83b74ca2a4f3/why_do_smoke_detectors_go_off_intermittently.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B44 5608 bytes
SHA-256: 22a6e2ac929ef59de6daac955c5805f2d7b57faf79cf0d9af93568e35b2554ba
font_01_sfnt_off0001ae33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE33 12364 bytes
SHA-256: 32100bba73a7d24eb274957e29167513d3f93a22bfcd03a325207daea4c51131
font_02_sfnt_off0001d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D639 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15