Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c961abdbabb754a…

MALICIOUS

PDF

103.3 KB Created: 2021-03-24 00:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7f0215c2abea5ae3320e1f20f71ffb78 SHA-1: 5b0b592f23db98919aa41ff08032ccedab05e766 SHA-256: 1c961abdbabb754a7963415f8035ebfe774c9b36a0d7588d2a8d0539dbdfd957
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 SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/123?utm_term=sahih+bukhari+free PDF link annotation
    • https://cdn.sqhk.co/zitedefew/girUhhM/jajewimenugigisamagenegub.pdfIn PDF document text
    • https://cdn.sqhk.co/nilofixogezu/qyjhBjb/danmaku_unlimited_2_apk_full_version.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/11181395672.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/fnBOa6A/children_s_swimming_pool_walmart.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/acrobat_editor_free_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/bPiiICX/easy_load_boat_trailers_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinirumawe/kqaVTje/gibozonatizudefe.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/hcjhz0w/free_movies_online_app_for_pc.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/bowenazalexawelewi.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/bazaxezurozefubobad.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/e5Jkiav/extreme_landings_pro_mod_apk_free_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/xfjdXje/voice_coaches_2020_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/mhbLHgj/black_beauty_supply_near_me_open_now.pdfIn PDF document text
    • https://cdn.sqhk.co/vefobinibe/ghibgEM/alif_laila_tv_serial_title_song.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/didQfjj/avast_antivirus_for_pc_offline.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/c7c35c22-542c-4103-bbd9-bb6f0bdbcbc9/how_can_climate_change_affect_animals_and_plants.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/87299614457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4fe00f6-6120-436f-a843-c4a3137aeb29/9578321053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830d5cb1-a2e6-48d5-a01b-0de309044d63/primary_secondary_and_working_standards_ppt.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_043d7d43d0be4764acc7569f56a203bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61563f09-3127-4be0-87a0-c69199ef7bed/72461193535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ff8d0d-9f86-4bfd-a258-7f106f8cd996/27487698421.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_e6522b8a054c419b8e890872419b56ea.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000167c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x167C4 22960 bytes
SHA-256: 89768c84763be8d75a7d8d40af5c73d793d07a7cc838fea83f3b88a021dd7bb1
font_00_sfnt_off00012d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D82 4952 bytes
SHA-256: 653b7417f2c5c74a1b4ec3f21e862a7111bd1e1a24d0bc5a28e502ec8fad912d
font_01_sfnt_off00013e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 12708 bytes
SHA-256: f852e09145f65f2437015f5aa3c3293dfb7fa734d75dc9eaefe3c260d8fd8b9f