Malicious PDF — malware analysis report

Static analysis result for SHA-256 5031bf48f1a73e91…

MALICIOUS

PDF

83.0 KB Created: 2021-04-01 15:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 28485ab34a62707b192ec62f41e426ff SHA-1: 54abfb63c50a595d89732d8782abfdd060faeb55 SHA-256: 5031bf48f1a73e91270605886a6a875192ea235ce3c3b77e2fc70333c14baa84
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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 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://lozipotod.ru/wix?keyword=biology+evolution+unit+test+answers PDF link annotation
    • https://xinagaxigivawiv.weebly.com/uploads/1/3/0/7/130739766/778fbb3.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/wirewexojoxofizir.pdfIn PDF document text
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/munafezixorigigajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_5fd2c87b88ab4.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/91bdc3e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_60256fa351184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fe6e30d04866.pdfIn PDF document text
    • http://artdebug.site/85795208258ttnsr.pdfIn PDF document text
    • http://blognews.top/45154307140px4u2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_6043d305100d7.pdfIn PDF document text
    • http://optamorem.com/julinaposmoep.pdfIn PDF document text
    • https://fefoxotavom.weebly.com/uploads/1/3/5/3/135328849/9c688d7741197.pdfIn PDF document text
    • http://copyright-supporthelp.com/auditor_general_report_on_municipalities_2018nxyta.pdfIn PDF document text
    • http://arfesopt.com/802279694025ol37.pdfIn PDF document text
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/35a14eacf.pdfIn PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/3178118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_603ad092436a1.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/woxorojero/skyrim_switch_tips_and_tricks.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/53227009312.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/besurumalaruguxogewuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb112da-7902-42e0-9f33-451c866df760/something_like_this_lyrics_nightcore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b854396f-7c13-4e3f-9266-10979c222351/how_to_save_download_app_to_sd_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a649f7f-01d2-4ae5-8ab8-dc6418113b99/bumoxozabixiger.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/cpm_algebra_chapter_10_homework_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40adc2f-537d-440f-84ef-43dbe0d447a3/rawls_theory_of_justice_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa375c1-37cf-41c5-9619-dbb275b0d3e8/best_drum_beats_for_beginners.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_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 5156 bytes
SHA-256: 0dd34c066d452270b22dc424bd6b7762f65b0d663e7461cfd32fdf160a6aa981
font_01_sfnt_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 10808 bytes
SHA-256: 3dd1c833024ed15d62a47d38a1634efda974186f1253e07805426ec990a939f3