Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e3cf166140fc5a…

MALICIOUS

PDF

167.7 KB Created: 2021-01-28 00:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d04a5010896283b998fe1ddbb3a3e8dc SHA-1: 1cd4fede65557d6a401666f9e571d9c7ae21d6fe SHA-256: 52e3cf166140fc5ad6c4798402b430b72b5a19c4c9ed52378349a8e1fa27d50e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://leonvi.ru/123?utm_term=splatfest+chaos+vs+order+poll PDF link annotation
    • https://cdn.sqhk.co/didatife/3CidCTH/22659936470.pdfIn PDF document text
    • https://cdn.sqhk.co/fowujizul/ujc89je/sodiruxexubevoradot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_600dc26268477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd14bacd7522.pdfIn PDF document text
    • http://worldthailand.fun/laboratory_skills_checkup_4_identifying_errors_answersb0p5l.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/jjNnasb/sugar_skull_coloring_book.pdfIn PDF document text
    • https://xonuguzuv.weebly.com/uploads/1/3/1/3/131382030/1615478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_600b65a78e178.pdfIn PDF document text
    • http://sushibara.net/touhou_mima_touhou_project_music_gameny9yi.pdfIn PDF document text
    • http://maska-respirator.com/juzuzafepagyg8sm.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/kogerapigosu.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/8888527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413228/normal_5fc711038d5bf.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/hijeid7/58778451436.pdfIn PDF document text
    • http://craftsmansmetics.com/zisexilenotizudi8kvno.pdfIn PDF document text
    • http://sis-paypal.com/flight_sim_2018_apk_free_download2u4ej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/naruto_online_hack_tool_v1._0.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/rifupofososorebemiv.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/cannot_connect_to_wifi_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/bareli_wala_thumka_song.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://www.gnu.org/licenses/gpl.htmlIn 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_off00020bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BF5 4376 bytes
SHA-256: 14e54c0c1c96d0df4145630e119a9b1bd88014f42bece1e0223176707e24458c
font_01_sfnt_off00021b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B50 5408 bytes
SHA-256: fd66ea5f0130ed52ab836e2423b7d3fb60a0bfac0da04e3240a1d153efb7c611
font_02_sfnt_off00022dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DAE 8224 bytes
SHA-256: 1ea2e52af37b6b0cb0ad6c717e15ee27c04182298a448b08bcbc812a74091dfe
font_03_sfnt_off0002447e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2447E 18312 bytes
SHA-256: 199e1668006aeae2e2466c7c01e001a2ba6a4a9f30e9f05c817aeb1b601fa650
font_04_sfnt_off00027aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27AA5 16128 bytes
SHA-256: 9086166160dda9bedfd621e8d7285e559f492595c20e0819f905e6483ec0cd4c