Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff62b1b0ef6237da…

MALICIOUS

PDF

84.5 KB Created: 2021-04-01 08:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d86b6391be637c9e4a98438ce0983db9 SHA-1: 51852e85b4b4e80710caa72abdc378575c31f185 SHA-256: ff62b1b0ef6237da80fafa5f902021d2da6972a70fc7d1b726126d5aad6d75ec
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'worksheet answers', which is a common lure for phishing or malware distribution. The presence of embedded URLs and the overall structure strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://soxebez.ru/wix?keyword=section+14.2+the+origin+of+life+worksheet+answers PDF link annotation
    • http://vijexibat.mywebcommunity.org/do_charcoal_drawings_sell.pdfIn PDF document text
    • https://terulupi.weebly.com/uploads/1/3/1/4/131406892/govuzebudawok_xefelupozijulow_legoleruvebo_segexixub.pdfIn PDF document text
    • http://kibesamifi.getenjoyment.net/34598801581.pdfIn PDF document text
    • http://situvupumu.medianewsonline.com/54777422168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_5fd920856dc4c.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/atrial_flutter_pathophysiology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_60608bab7eef0.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/45338840166.pdfIn PDF document text
    • https://zulitaxovali.weebly.com/uploads/1/3/5/3/135351491/4274884.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/merod-vowis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492240/normal_6004bf91d140b.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/f6a500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_6047d1b596eb3.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/wanini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_60315f0ef323a.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/tasufagijaremo/82526063476.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/behind_closed_doors_b_a_paris_download.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/mpsc_exam_books_in_marathi_download.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/where_to_find_serial_number_on_ezgo_rxv_golf_cart.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/tubegesajopub.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/audit_report_of_reliance_industries_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/alabama_power_report_outage_phone_number.pdfIn PDF document text
    • http://dapibudajemuk.atwebpages.com/21907446016.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_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 5708 bytes
SHA-256: 5ac1e9436aca82eb7e901c4c2c3c4ce3d1b66feff74870cc3a2080b819245ac9
font_01_sfnt_off000120a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 10504 bytes
SHA-256: f62eb1e9edcca8b3d55c0069042bd453b15112fad04d357c501e43fc3490fa35

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