Malicious PDF — malware analysis report

Static analysis result for SHA-256 41db57d4d3b69c5b…

MALICIOUS

PDF

81.8 KB Created: 2021-04-07 18:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 95a6a40a33c7891de46d7d03746c7110 SHA-1: 0bbe9ae9293019dba8e1dabdd947c03b248c1915 SHA-256: 41db57d4d3b69c5bedc96c6d0f9a471361147808d098e8227c9508760ecdbc50
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'golowaki.ru' which is associated with a link farm and potentially malicious content. The document body, though heavily obfuscated, suggests a lure related to file conversion, likely to trick users into visiting the malicious URL. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=cara+convert+mp3+ke+midi+dengan+audacity PDF link annotation
    • http://abwaab.su/zmodo_16_channel_dvr_with_1tb_hddfxk8n.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/10607549992urjmb.pdfIn PDF document text
    • http://itfamily.info/kiragideletanakudanmywr.pdfIn PDF document text
    • http://salea.site/22206995058o1jfh.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/haPifhb/88194515527.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/KBjbf9e/lewivot.pdfIn PDF document text
    • http://stnold.com/night_owl_dvr_buy6fv81.pdfIn PDF document text
    • http://zoo-taxi.site/gakebitanasazidfb7k8.pdfIn PDF document text
    • http://beamorem.com/29793761229odpwk.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/Rhfijjh/idle_knights_apk.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/8875bb0b-495a-4f19-ba82-b38775bbf415/27576637000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93bd66f-e917-4179-a0cc-62d1f622de36/29870082327.pdfIn PDF document text
    • http://dezoruxeg.epizy.com/12th_marksheet_online_cbse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9d4dac-f68e-405a-b384-79b27e3e3940/what_is_the_smallest_second_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c79f205-ea8d-498d-9a18-bd823ba7fb13/29656936506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/407651ff-f937-48df-8b7b-b2c6c06031f1/line_6_spider_v_120_mkii_modelling_combo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391d49d7-47fa-4ed6-a967-eda4efc69c4c/the_love_dare_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb25e1cb-eae2-44ec-bfe1-c6a6f9c0aac4/stihl_hedge_trimmer_petrol_wont_start.pdfIn PDF document text
    • http://zewedazogiwake.rf.gd/20203043990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531da065-ad1a-4223-b176-1b11d81e779a/meade_etx-80at-tc_manual.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_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 5480 bytes
SHA-256: 39fdb597eef4ff6387d936f7c0c1d000325fdb36bb3e3e7a913a11709968fa15
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 11020 bytes
SHA-256: 5b59d57072970992eb8feb222d8d1d1283221fd5fdeb64a07b6be1f70f5d805c

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