Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a2418c5d7b9b11…

MALICIOUS

PDF

91.2 KB Created: 2021-03-28 04:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f08e7b092837dd0b5a312fb8512dfa61 SHA-1: f4b19c07166882349f9f326d90053b89e5171c6e SHA-256: 68a2418c5d7b9b11dc32fd454c332165e2ec48500aaabdb69e1e3437475aad03
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. This behavior, combined with ClamAV detection and ML classification flagging it as malicious phishing content, strongly suggests a malicious intent to redirect users to potentially harmful websites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://jottigo.ru/award?keyword=ancre+hillsong+pdf PDF link annotation
    • https://cdn.sqhk.co/bitizulokiva/pgcVhcJ/seven_letter_words_starting_with_co.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/magic_tree_house_merlin_missions_book_level.pdfIn PDF document text
    • http://tradestaroffice.com/how_to_transfer_contacts_from_lg_to_lg_phonepwq4e.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/48acbc5de95079.pdfIn PDF document text
    • https://cdn.sqhk.co/titusegik/djaigXZ/mudoribinobaxi.pdfIn PDF document text
    • http://golixudib.mypressonline.com/unknown_market_wizards_book_review.pdfIn PDF document text
    • https://bososotozakep.weebly.com/uploads/1/3/1/4/131437593/sololizukulon.pdfIn PDF document text
    • http://jnatural.space/236272249965ic4j.pdfIn PDF document text
    • https://lowujowe.weebly.com/uploads/1/3/5/3/135320741/zeninuwunawip.pdfIn PDF document text
    • http://mobile-media.moscow/ramivomnp5z.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/Sl5eja7/73744458052.pdfIn PDF document text
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/5d6bbbf8db39a.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/jijhcif/rotor_riot_mobile_gamepad_controller_for_android.pdfIn PDF document text
    • http://loveworld.club/are_cuisinart_griddler_plates_dishwasher_safe7nfrt.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/what_does_a_constructor_return_c.pdfIn PDF document text
    • http://top-shop-store.website/editing_picsart_background_hd_images_download_zipkorcc.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/cRi1tgd/92389408269.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/hgeighi/nalelikuvodivufijodu.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/hnifiee/cyber_hunter_apk_softonic.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/gukukelerurudaware.pdfIn PDF document text
    • http://reduslimitalia.website/rininugomajisasunek8oe8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutenujute.myartsonline.com/jiseronazasano.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000144de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x144DE 17400 bytes
SHA-256: 183a195986880a4c4c1b011ed627527ee07f8a1c42b1e2dca2c1b592e38a707d
font_00_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 3776 bytes
SHA-256: 7abee62b52f2f5c79443d0e7cb432644f7437fbc466beaf7cc6d102eff3a4b64
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 5196 bytes
SHA-256: efd32d23a2e90d4954944b145f6e73caaaa5b001e4f4b5913ed84f4a9440371c
font_02_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 16644 bytes
SHA-256: 4b874eb90b47ba80756c71337e25cbe4ffd8222174f06ee1e310a38b4b3bd470