Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdc8ae803ff69b8…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 23:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a0908268a5b6dd935e9c3b32bbf76ff SHA-1: cec514659174b9bfb8cae894e40032ce451ae244 SHA-256: 5bdc8ae803ff69b8cad81238432715ee6dfaf830dae84c9f93a7aa038394607b
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to a link farm and redirector service, suggesting an attempt to distribute malware or phish for credentials. The embedded URLs and the PDF's structure strongly suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/wix?keyword=dokk+os+3.0+apk PDF link annotation
    • https://cdn.sqhk.co/jawafurovif/idjcjiz/nex_music_player_farsroid.pdfIn PDF document text
    • http://sq11mini.com/cloud_computing_services_exampleslxryj.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/bEHLIqO/rixavoz.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/evFgj1X/21254519901.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/cgcA7jg/ladybug_wallpaper_for_android.pdfIn PDF document text
    • http://thefortykuti.com/jowatikuwaragikin2h8m.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/cYVgiAH/zion_national_park_narrows_guided_hikes.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/T4ijigi/57451720698.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/zepezogimiguko.pdfIn PDF document text
    • https://cdn.sqhk.co/wafexumu/LihAhbE/vodugodumufojar.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/Uhco7je/dwell_time_dialysis.pdfIn PDF document text
    • https://cdn.sqhk.co/rebawigabog/iccbZhi/sap_outstanding_invoice_report.pdfIn PDF document text
    • http://myfoxing.online/hdfc_ergo_motor_claim_formumlvp.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/heijLic/8704279187.pdfIn PDF document text
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/2590178.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/VjcZzhj/jivumavira.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/IpiaWuU/zujuvifisexowufised.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/64f41860-9ae2-4658-9d21-74574659c13a/24778171145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea1a621-d571-40dd-9516-a822bdb97b0f/dirojatupomozavuripobenig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2169c3e-8b20-4af4-a05f-11bed233bae9/jubutupinoroxogo.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_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 5084 bytes
SHA-256: d423b3126f49537ff02a631a7cad614cc0be81854bed6eaaeb9f08d412617115
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 11228 bytes
SHA-256: e3acad516eb92518d24fd33161fd5ec926eac7f266cd8d252d9a629ba6715a45