Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a48266cae236416…

MALICIOUS

PDF

85.7 KB Created: 2021-06-03 22:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 89c7484c106b70e10ee0950dcb4102cc SHA-1: e8680fc57e379571f48d6dc0b1596d8db54d9990 SHA-256: 1a48266cae236416a5fe62bc45a3284f06f5ede956500eae67e1d9343f17d95d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that is presented as a 'worksheet answer key', a common lure for phishing attacks. The PDF structure and embedded content suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/pbw?utm_term=stars+galaxies+and+the+universe+how+far+and+how+fast+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403414/normal_5ff03eb61876b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5ff8071f11f15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dda38cc-d823-4ba6-ac4a-c62fbf48fd72/tcnicas_de_evaluacin_de_presupuesto_de_capital.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/99819125819.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/fahrenheit_451_activity_packet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a96707-918f-44f1-8a02-746277fee143/dungeons_and_dragons_books_amazon.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/4910357358.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144413253/how_to_take_video_with_flash_on_iphone.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144498369/18564163272.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/f/printable_calendar_2021_march_april_may_june.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/throne_of_fire_graphic_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a35e1ba-032a-471c-9641-e8b663d59ea7/graco_pack_b_play_set_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ccd93e6-9498-4b7b-8a6b-5786b6f23543/the_little_match_girl_oxford.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e511e9f-1528-435a-8b26-bd084f31abe8/vanimaxup.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/gigatexitox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7af37a2-de23-402e-a5c9-23e7e56478a5/verbos_irregulares_en_ingles_en_pasado_participio.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/clash_royale_tweaked_ios_no_jailbreak.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_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 5656 bytes
SHA-256: e570352eae7715d503b55174a854abe17cd41663e0160ab37c2d11bdd9ae617c
font_01_sfnt_off000124af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 10832 bytes
SHA-256: 9937e7c18dd9f7459d6b7b88afbf698da9ef741a4d557b8b93042b6f64855389

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