Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cd6bcedc4a5629…

MALICIOUS

PDF

93.6 KB Created: 2021-03-15 20:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 58763099d28e8f9b9d17f49b22b2a7f1 SHA-1: 5553be610e269d34578cbdb1e10a6b2655587959 SHA-256: e7cd6bcedc4a56297eafb401397a406b3f817c859f3edc8936c940a93269d1ec
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 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=aptitude+test+questions+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368227/normal_60028e608fea1.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/alphabetizing_worksheets_for_grade_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447267/normal_600132585a012.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/ghyjg00/best_mud_tires_for_sport_atv.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/tork_sa300_digital_timer_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_603db7cf8961e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_60055c397c748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_60476ff89b594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506170/normal_60421f1d68755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fc74f7dd6cbf.pdfIn PDF document text
    • http://waliduv.mypressonline.com/is_fitbit_aria_2_body_fat_accurate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495558/normal_5ff654a4e4ae6.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/bugfzhb/stupid_zombies_3_mod_apk_download_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/ioWjfhe/motorcycle_helmets_for_dogs_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/bbIHsjf/walking_dead_season_10_episodes_how_many.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_6041e997bb39d.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/FlhhLja/hex_commander_fantasy_heroes_hack_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/61cd05e0-4777-4243-972e-ed0d703f793d/how_to_replace_a_drain_pump_on_a_maytag_neptune_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/gajijinovezojudosileki.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/edema_pulmonar_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/vcds_17._8_german.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07723b90-bd75-4122-8fdf-8aa145afa1ae/nepufojibinaxerazososi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfbffb1-096b-46c0-bb34-b797a4926bb7/56726850220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5029527-550f-4dbe-ac25-41ac710a054c/15481926710.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/51655372932.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
    • 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://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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 4696 bytes
SHA-256: a5ffe63ae5055cde1b3a313b259c8cd952e161abc70d2f22be15dffa0910d68a
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 10824 bytes
SHA-256: 962c3abf39a64b853068749cd3a1b11dcdfc4792c61f946b684a726fd8ca4dae
font_03_sfnt_off00014502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14502 16132 bytes
SHA-256: dffdd32b9c290446653620a54c5d872f7eec68ecee48cb503e5cfcfec63ed28f
font_04_sfnt_off000159c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3