Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d574e7d61fc54d…

MALICIOUS

PDF

70.0 KB Created: 2021-02-03 07:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5431e7e073d67c87737d9c466d86d08f SHA-1: c8361bd3b4d140b6c9d787558a4e1d493645b510 SHA-256: a1d574e7d61fc54d37151ccdc7b33bb68fb47565fbd058b86088c68b45a14d69
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a phishing or malicious redirection attempt. The document body, though heavily obfuscated, suggests a lure related to educational content ('adverb worksheet for 3rd grade') to entice users to click on these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=adverb+worksheet+for+3rd+grade PDF link annotation
    • https://cdn.sqhk.co/xevowuto/itLyjaK/tengai_shinsei_databook.pdfIn PDF document text
    • http://free-at.pro/learn_english_through_song_lyricsoasmg.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/gjhiMij/sector_14_faridabad_haryana_pin_code.pdfIn PDF document text
    • http://my-favshopf.online/dapujax0d7fs.pdfIn PDF document text
    • http://idealicacolumbia.site/april_clough_actress_cause_of_deathfc0rx.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/iihgdia/hocus_pocus_2_trailer_2018.pdfIn PDF document text
    • http://wowitaly.space/3404909362hq7ys.pdfIn PDF document text
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/vimebasarunipu-fadinilesev-zonete-vijezu.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/jfJcjZ2/epic_battle_simulator_2_level_30.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/24877811094kalfh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewipevi.rf.gd/myself_essay_in_english_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/27636016848.pdfIn PDF document text
    • http://zefitog.epizy.com/google_drive_report_malware.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_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 5648 bytes
SHA-256: b5ec4936ae678d0e2b36cafed4cfb7a799e5b8944272e32219d42f68b762c28b
font_01_sfnt_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 10240 bytes
SHA-256: 420de2ff0a0a9f65732aad9af47f896defe419151db00804dedf0ee275c13f1d

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