Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57ad5cf37f44028…

MALICIOUS

PDF

113.4 KB Created: 2021-03-10 11:11:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3c6c594ed1ff0b1f294a62962cf6cc7b SHA-1: 24f50641c6d6ed591b660abba10137272f426340 SHA-256: c57ad5cf37f440284f5c214d4cc5417bcb72f283c28320ef0a731e3185996654
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or dynamic DNS services, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=check+bundle+null+android PDF link annotation
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/jesusukejusugin.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/roril.pdfIn PDF document text
    • http://radasekot.iblogger.org/kanizi.pdfIn PDF document text
    • http://mujogatebili.22web.org/lifeproof_sheet_vinyl_flooring_reviews.pdfIn PDF document text
    • http://wdd13.ru/self_belief_quotes_in_hindi65k7l.pdfIn PDF document text
    • http://frankiearvelo.com/51476614865b4zjm.pdfIn PDF document text
    • http://debasowajedo.22web.org/how_do_i_adjust_the_temperature_on_my_lg_inverter_refrigerator.pdfIn PDF document text
    • http://kunabote.22web.org/82709098142.pdfIn PDF document text
    • http://harkateine.fun/shadow_and_bone_review_indonesiaox7bk.pdfIn PDF document text
    • http://zexedebamuwep.iblogger.org/can_you_work_during_covid_19_if_pregnant.pdfIn PDF document text
    • http://rezotu.xyz/free_gevalia_coffee_maker_coupon_codeevyu3.pdfIn PDF document text
    • http://fortuneo.biz/lelig05mgl.pdfIn PDF document text
    • http://dikiwezuvejeve.iblogger.org/baraka_da_prince_jichunge_audio.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
    • http://duxuvogavibu.epizy.com/which_epson_printer_is_best_for_sublimation.pdfIn PDF document text
    • http://mamitepibo.epizy.com/84439668286.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/b_pharmacy_colleges_in_hyderabad.pdfIn PDF document text
    • http://mogorixonub.rf.gd/update_android_samsung_a8_2018.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/what_are_the_four_principles_of_darwins_natural_selection.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/bejukus.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/goop_gift_guide_toilet_paper.pdfIn PDF document text
    • http://zofimidenilasa.rf.gd/usmle_step_1_first_aid_2020_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001712b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712B 4880 bytes
SHA-256: 9ed1fc8e10ae6866c53d1073f0ad390ae4250fb63cc0b8e84781c0e5cbc77850
font_01_sfnt_off000181a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A2 11728 bytes
SHA-256: 38c879829f9ef67a6cf0a18d2d29a6185e00bbe8683408a4d9453f3202932d43
font_02_sfnt_off0001a9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9D2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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