Malicious PDF — malware analysis report

Static analysis result for SHA-256 043c702377545656…

MALICIOUS

PDF

86.3 KB Created: 2021-03-09 15:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1cb3ec88fc6e9f70b3184e86bb1d822c SHA-1: 6d76608ecfb1e27e19455080e80dcc8cd5f9bfb5 SHA-256: 043c7023775456563c50f870dc8326f22c46e3051879acbcc10b0ceed414cdcf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. Several heuristics, including ClamAV and ML detection, flag this PDF as malicious, likely due to its deceptive nature and potential for phishing or SEO manipulation. The embedded URLs suggest an attempt to redirect users to potentially harmful or misleading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=frases+hechas+en+ingles+para+pdf PDF link annotation
    • https://cdn.sqhk.co/kuruwoke/ghcBWIi/zombie_shooter_2_game_free_download_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/dijgfmZ/startup_business_plan_sample_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/jaggjb8/fekag.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/xghjIji/nail_art_and_spa_lowell_michigan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fcea6f694375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5ff4a94ab25df.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/iatZhhi/16938851440.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/iajgIih/43084010678.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/Zj8Plje/vepaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_6040162ba5d08.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/95257571-6536-4887-bcb2-b9503a218c32/kipisigenaduxegusubu.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_7efdd2b244944b19bf51e3b524d4ce8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3eeb79-d225-4f98-a6a3-695d6bd1d60a/43922840152.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_56c7cbb561f144fb8b66f0853a1c7072.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/331a51f8-5732-416c-91e9-5a012e0e0112/the_logic_of_sports_betting_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eeaca37-ebbf-4bcf-b4eb-1ed7ff9feca7/21770993466.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_bed635671b464dbbb8fc40de23b8a4a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b34daf2-ab66-4d56-9ccc-216904564db8/how_to_put_on_gentle_leader_leash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a281baa-accc-482c-8563-b16364820b77/canon_lide_210_driver_mac_os_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e73bec1-53e4-403d-98d6-fe15fab5e264/suzutazup.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_bca2e233dade4ab6af23ef8f69e6050e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 5372 bytes
SHA-256: f55c107b625c47091a26a204d1c536d8dfeb3e7fa6326cf6966d9028c4a68baf
font_01_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 11784 bytes
SHA-256: 7c04f7595600db6ab6992ec452c426e16c9331cfef292b9b7608a2f8f62f7b38