Malicious PDF — malware analysis report

Static analysis result for SHA-256 53daef5d5080bf3c…

MALICIOUS

PDF

117.3 KB Created: 2021-03-29 16:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0edfbd5cbfdaad5e7c1c8ebb97629fe0 SHA-1: e95a573026439947f4fd7db64ba90ab2f7e2e5f3 SHA-256: 53daef5d5080bf3c978382f4b92160539ddc603538e03cc8f5897845bc4d8f84
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=audi+s4+avant+usa In PDF document text
    • https://cdn.sqhk.co/gutejalajige/0Mlxvgg/amazon_alexa_show_5_stand.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/ghcRhdB/66460523315.pdfIn PDF document text
    • http://teksol.xyz/fuzivojugil0se.pdfIn PDF document text
    • http://tozemudezajif.mygamesonline.org/amando_a_pablo_odiando_a_escobar_libro_completo.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/arduino_bluetooth_programming.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/battisti_canzoniere.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/ejaEqvM/arjun_kanungo_fursat_song_video.pdfIn PDF document text
    • http://evatopshop.xyz/extreme_sports_car_driving_simulator_racing_gamesm81n5.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/ghi6ies/xusujadagoloso.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/c9Mdmii/7647142068.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/jb2heJU/top_box_office_movies_2015_worldwide.pdfIn PDF document text
    • http://hookup754.fun/48164949547gnzmu.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/shadow_and_bone_netflix_series_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/CVlhiBj/update_all_apps_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tofepojafuz/baOgeie/54711728479.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/makalun.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/historia_del_estado_de_mexico_desde_la_epoca_prehispanica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/ladisis.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/how_to_do_a_hard_reset_on_s4_mini.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/vuzazufumimuvivolovav.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/dafelumikilinaxuriwuvenew.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/wadodufatonovidi.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/revista_natura_agosto_2020.pdfIn PDF document text
    • http://rodisasedozax.myartsonline.com/momuz.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/cafe_racer_1._051_2_mod_apk.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_off000178bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BD 4828 bytes
SHA-256: d934b082ec9a398b42760f34691d6dcc5ac4dc0e5e119d99d77d040a8c323ec5
font_01_sfnt_off0001894b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1894B 12208 bytes
SHA-256: 1aa10601995e972051047db9f1d09495bd9771ed8114997d350409657190d31d
font_02_sfnt_off0001b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B23B 16088 bytes
SHA-256: 9900a2061f4db6d5851a1fb623229e1c91a1f2215fec638d1e55d9f0c32ecb7f