Malicious PDF — malware analysis report

Static analysis result for SHA-256 27120a3f91b79707…

MALICIOUS

PDF

83.7 KB Created: 2021-01-21 04:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c39b96e8a51bc5ad079da3c5db7b5bb9 SHA-1: f911177f10c20b7cbc972ddd1e0a9161f1665090 SHA-256: 27120a3f91b7970785b814bc996adea1e5752a23689eb5c769c7da2df85a53ef
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the PDF structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

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://traffnew.ru/wb?keyword=nigeria%20latest%20news%20live%20today PDF link annotation
    • https://site-1168374.mozfiles.com/files/1168374/tamalarutiw.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/YWmMjMt/steel_ball_yba_item.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/7679982.pdfIn PDF document text
    • http://begedotupatato.66ghz.com/vertbaudet_code_promo_report_de_paiement.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/ghia0jf/guess_the_cartoon_character_blocks_quiz.pdfIn PDF document text
    • https://site-1173610.mozfiles.com/files/1173610/lutesumowenapenorogazeb.pdfIn PDF document text
    • https://duvugegigoga.weebly.com/uploads/1/3/1/4/131409055/remelifosof.pdfIn PDF document text
    • http://besuxiju.22web.org/blocking_private_numbers_on_android.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/gjPQwu7/27515865033.pdfIn PDF document text
    • https://cdn.sqhk.co/bumotinidopi/ji454ic/syfy_fantasy_shows_on_netflix.pdfIn PDF document text
    • https://site-1177407.mozfiles.com/files/1177407/troll_face_quest_video_memes_2_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/egeiiRA/sure_goal_goal_predictions_today.pdfIn PDF document text
    • https://cdn.sqhk.co/wifepodilojo/gegfjhe/get_free_followers_on_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/dCzgde3/floor_puzzle_heroic_zero_hour.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/jejum.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/antivirus_app_for_laptop.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_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 5216 bytes
SHA-256: fd2e473a2e2d3082649b5c3d6b9feecf36e2d5c26f2e8c3d648f47829f5e6534
font_01_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 11060 bytes
SHA-256: 4aa85506018e2275501bbdf5b575f54be19715c7c79d5e70ac7f718d530e14e2

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