Malicious PDF — malware analysis report

Static analysis result for SHA-256 898501cc2692f391…

MALICIOUS

PDF

138.9 KB Created: 2021-04-03 20:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c364b0270525206a23257ea33325ae6c SHA-1: bcc415eb45cb36eb2c5cf8eea9c357ed3a8d2074 SHA-256: 898501cc2692f391103328c07d5f79d6b3d0c9b4507cdbe33e8db8256fe24068
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'math worksheet answers', aiming to trick users into visiting malicious URLs. The presence of embedded URLs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/wix?keyword=get+the+message+math+worksheet+answers+page+9 PDF link annotation
    • https://cdn.sqhk.co/ravusigi/VXJiilE/winky_lux_target_mascara.pdfIn PDF document text
    • http://pulibibebobo.iblogger.org/82750269790.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/62458289826.pdfIn PDF document text
    • http://zumbayuliya.online/91601767168kudfd.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/Qjhihhi/melavu.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/hjajjn0/47448305631.pdfIn PDF document text
    • http://lenorimageb.iblogger.org/3749034812.pdfIn PDF document text
    • http://bandalet.club/michelin_guide_hong_kong_2019_listwy684.pdfIn PDF document text
    • http://termometr-medikal.site/mandated_reporter_nys_justice_center8llra.pdfIn PDF document text
    • http://filmera.ru/pipupapinavedolozidutu913d3.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/kizifigidokuluwekes.pdfIn PDF document text
    • https://cdn.sqhk.co/zoraxiraga/3ciiWNP/baltimora_tarzan_boy_extended_version.pdfIn PDF document text
    • http://springwin.space/kylo_nifi_templatesysjbs.pdfIn PDF document text
    • http://atomlinux.com/pearson_geometry_textbook_answers_page_153bkb6l.pdfIn PDF document text
    • http://dkmz3.club/88258212783211xa.pdfIn PDF document text
    • http://mastericy-chistoty.ru/zezelulofasepijinaveticbov3.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/c2dd9fb0-ef26-431e-9006-67d07011e493/nituluzenusopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3e3fd9-1fc7-496e-b046-15ec4e65a0cb/surarose.pdfIn PDF document text
    • http://bupalim.atwebpages.com/pofarusitos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978336cc-87eb-40e1-b5ab-e12004e1ba13/82399850320.pdfIn PDF document text
    • http://fuzadakeju.epizy.com/antiacidos_durante_el_embarazo.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_off0001e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E18F 5544 bytes
SHA-256: d6e0016c35e4ac881143fa3d101771e34a67357bc56078e8759b8fc2a775b94f
font_01_sfnt_off0001f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F44E 11436 bytes
SHA-256: 8fafc2fe945186f26d340cba497099e4e1790cfc0b5119bbb5dae713677bf40a

Open this report in the interactive analyzer, or submit your own file for analysis.