Malicious PDF — malware analysis report

Static analysis result for SHA-256 87241c5c39e5f86a…

MALICIOUS

PDF

135.8 KB Created: 2021-01-23 18:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e86b03358a1eb164ed02f6428f69dc26 SHA-1: 9dd187a97a74ad6679bcad3c47b8d33a90e45413 SHA-256: 87241c5c39e5f86a46a7e45d19ff338a6ca9e4ad0db1e7ffe4ca50d6bbe7d7ab
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the 'invoice/payment lure' heuristic point towards a phishing attack designed to trick users into clicking malicious links.

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/123?utm_term=all+the+mods+5+guide PDF link annotation
    • https://site-1174503.mozfiles.com/files/1174503/fishing_rod_heart_clipart.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/Njcjdgh/stickman_vs_zombies_hacked_unblocked.pdfIn PDF document text
    • https://site-1177351.mozfiles.com/files/1177351/instagram_like_video_player_ios.pdfIn PDF document text
    • https://site-1178084.mozfiles.com/files/1178084/emma_the_cat_gardener_my_virtual_pet.pdfIn PDF document text
    • https://site-1176775.mozfiles.com/files/1176775/stock_tanks_iowa.pdfIn PDF document text
    • https://site-1172574.mozfiles.com/files/1172574/cricinformer_kabaddi_telegram.pdfIn PDF document text
    • https://site-1249670.mozfiles.com/files/1249670/drawing_conclusions_worksheets_for_high_school.pdfIn PDF document text
    • https://site-1258514.mozfiles.com/files/1258514/adosphere_2_guide_pedagogique.pdfIn PDF document text
    • https://site-1084052.mozfiles.com/files/1084052/space_racing_3d_star_race_game_download.pdfIn PDF document text
    • https://riragipus.weebly.com/uploads/1/3/4/3/134358734/bd47e93a5284.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/4heoW7K/omegle_talk_to_strangers_text_chat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408702/normal_5ffe98540bc87.pdfIn PDF document text
    • https://cdn.sqhk.co/tezesafura/eghTibW/vogatar.pdfIn PDF document text
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/fosanivu.pdfIn PDF document text
    • https://pitubesisimebi.weebly.com/uploads/1/3/2/6/132681325/widadonemil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBAA 5044 bytes
SHA-256: 3727c522ef878d17ab88f5bc6f7cb0e60ab6e6d7de2ce0707e86d331fe3b7195
font_01_sfnt_off0001ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECB0 11036 bytes
SHA-256: 3f8f4b3ebdc2d2ed0586b9d4345160c49f7be734ee38f199be2edc4a1e29f28f

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