Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8d38b46abbf3a8…

MALICIOUS

PDF

88.2 KB Created: 2021-03-18 00:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 34636b417a83d0a6b319ca6ecda5484e SHA-1: a97cd2494eba7223e1ad476c184c77ed71ccdc09 SHA-256: 5f8d38b46abbf3a82f50d87ac54f91accda832663bb97215048bfaa366328edb
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, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=aminoacidos+que+son+pdf PDF link annotation
    • https://tilipigenetuwa.weebly.com/uploads/1/3/4/7/134770736/zepagem-gujemizituzi-tapetip.pdfIn PDF document text
    • https://tupewolukup.weebly.com/uploads/1/3/0/8/130813866/9953276.pdfIn PDF document text
    • http://top-salez.site/alien_shooter_lost_city_mod_apk_revdlhtlou.pdfIn PDF document text
    • http://uabiomanix.xyz/timex_mk1_chrono_nylon_indiglo_mens_watch_tw2t10600vq3wsij.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/fikudo.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/d0e3e648e81.pdfIn PDF document text
    • https://rukepeninosiwul.weebly.com/uploads/1/3/1/4/131406291/faziburixa-lirumukifijite-dopimatug-dirarejajojew.pdfIn PDF document text
    • http://5-euro.info/liwuluziremexurolisapam39cl.pdfIn PDF document text
    • http://prostochillforum.fun/download_pc_creator_pc_building_simulator_mod_apkkc9ti.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/jnicqgi/bad_day_at_work_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/ic9icnz/thriftbooks_online_coupon_code.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/imjcgai/catfishing_meaning_slang.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/hejdhg7/babejepiwanigikowek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_6e22fa16973c4a0ebc3893fdc8ca99f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29927457-536c-4fa2-863b-c63755a8da3a/numubagibojixu.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/potential_barrier_quantum_mechanics.pdfIn PDF document text
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_f6ffae91b15e497fbd35d9b37cf9afbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f15e05-0561-45c7-b563-d83bfaced63d/can_alexa_show_play_ring_doorbell.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_2f21f87404b645c89c80644f4ad7b1a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/26230822508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f568361-8e85-4a08-a351-6f8dbd144f37/skil_circular_saw_lowes.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_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 5288 bytes
SHA-256: b8a6f38d1bef763aa147e93f4a9e6b30b59d6efcddccf5dbe2c9d4c240d3ba86
font_01_sfnt_off0001272f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 13232 bytes
SHA-256: f75f4120236029f6eb8df57e34f6dd90870db191178dbfdb2f1c3fc1ee1af802