Malicious PDF — malware analysis report

Static analysis result for SHA-256 9423c366264cf3e2…

MALICIOUS

PDF

78.5 KB Created: 2021-04-05 00:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 34a3a2912bb26fbf102d46f2379d10da SHA-1: 08c1469d9c93619a2466e1cb1d833cb3eca0b0f5 SHA-256: 9423c366264cf3e265cde110294da0e0e1aec39b89c024b0e080d92c05e309cd
184 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and link analysis point towards a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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 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://dafemum.ru/strik?utm_term=an+actor+prepares+constantin+stanislavski In PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/korepelinadunasoz.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/bsci_code_of_conduct_in_english.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/21595359999.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/6241521.pdfIn PDF document text
    • https://fipowawebes.weebly.com/uploads/1/3/4/6/134601566/d891b2f8b9d1.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/94298269466.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/eEigZhg/61270460336.pdfIn PDF document text
    • https://tebumozokafu.weebly.com/uploads/1/3/4/4/134471783/e23058.pdfIn PDF document text
    • https://valabokewem.weebly.com/uploads/1/3/5/3/135311070/kededezaxup.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/cYZsnRd/xejofilujukezowavam.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/arduino_wifi_tutorial.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/newalizujojavumufesuvo.pdfIn PDF document text
    • http://rajajime.mypressonline.com/area_of_2d_shapes_formulas.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/6e36a8d2-3863-4bb0-93db-da86e7fcff4c/42226184038.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/4641730082.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/arabisches_alphabet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5e19e0-97db-42ab-b8dc-4e07b88eb8e0/43442876046.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/gorojexukuxakakimofarem.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/marriott_s_practical_electrocardiography_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ffbda3-a5ca-45b9-9d4a-2befd1db05f6/what_to_eat_plant_diet.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/aquaculture_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df236448-aeda-4658-b777-3ea2dcc57982/baby_got_back_song_youtube.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/jipeletizores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadefd36-95a6-47ba-a5b6-02ad76763b66/5508804306.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_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 5040 bytes
SHA-256: b11b286d0604232d073bfd491cb135e7fdef117b6d6c96d2778f3aa8105b8efd
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 12700 bytes
SHA-256: 58d0e58fef50a89e6cac06a52fffdcf120bad96b993b9ee47c59f05bb6d77df7