Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e205ee27eba2b4…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 05:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9706e9b6d2480c5927895638feac9986 SHA-1: f0f05d15e99a7a6dc3f64c9bf7d956aa638ee60a SHA-256: 23e205ee27eba2b44b8ec892a91964cc8124b9bca73d6331dce5e2b0e0173e9f
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=office+absent+letter+format In PDF document text
    • http://dirozigumifew.scienceontheweb.net/list_of_subordinating_conjunctions_for_complex_sentences.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/geGHicu/top_speed_drag_racing_3d_mod_apk.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/zasiseminaz.pdfIn PDF document text
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/3551025.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/frosty_the_snowman_original_song_lyrics.pdfIn PDF document text
    • http://lovepositions.info/jalajutojabarup9so8q.pdfIn PDF document text
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/2182949.pdfIn PDF document text
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/3451148.pdfIn PDF document text
    • https://cdn.sqhk.co/nakusunegud/fPidijG/42397686403.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/yjfhfjb/how_to_recharge_prime_video_on_app.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/BCIibQW/sticker_maker_photo_stickers_for_wastickerapps.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/saxevonemekala.pdfIn PDF document text
    • http://gufutaca6.xyz/101792504188jc8d.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/7424e47d-cf1b-4446-802a-f4bb31333c89/61691878290.pdfIn PDF document text
    • http://dijuvunote.onlinewebshop.net/zezebewezosadat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce306270-2e33-4e8a-ae28-b3623f7add30/81952686556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d5ce6a-3f40-46d5-855e-d2e225ba8172/60927749657.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/simplilearn_data_science_course_fees_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84be28f1-d024-4697-89b4-e1b19965dd24/63502019756.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_78acff603631448e9c8501d80f12ff9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2318815b-b3cb-4179-a274-6468f79f80f0/60187761435.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_f963d69cc662498b83a813c88d5032ac.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 5196 bytes
SHA-256: d7e154df9198049a9c45f8b31c73332bb58e250512b5ac317caaeab9e7f565df
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 10408 bytes
SHA-256: 27af7da5e971a029d255e5d28d870a2e48d146b205f1997c0e977fdaff945303