Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97bd448d8f2a158…

MALICIOUS

PDF

83.5 KB Created: 2021-03-27 23:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6a98e44158a134c25be48f4c0bbd4af8 SHA-1: e7493a7028269d083ec76e177daa5449547f10c2 SHA-256: b97bd448d8f2a158b0fdfd7d66f96efff23ec8f8516303962ed0d63a5939484e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. The presence of ClamAV detection and ML classification as malicious suggests malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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.
  • 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://resalured.ru/award?keyword=calligraphy+sheets+pdf PDF link annotation
    • http://jurabumatalepa.iblogger.org/how_to_unstick_a_ge_trash_compactor.pdfIn PDF document text
    • http://xrootunited.com/beauty_plus_app_for_androidibvn1.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/4837038.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/SngjBhh/metal_slug_2_turbo_rom_download.pdfIn PDF document text
    • http://kieverts.xyz/xevekoraruzekteyk3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5fcbfaba14da2.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/ghie7El/denaluxepone.pdfIn PDF document text
    • https://wajodiladifaxuv.weebly.com/uploads/1/3/4/7/134768632/folemunoreb.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/hgcO1hh/sharpened_romberg_test_norms.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/arihiic/delicious._com_dessert_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/ig3ejaT/apple_iphone_10r_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zeputefilu/7DgiYfr/muwudetuj.pdfIn PDF document text
    • https://palogipotutaz.weebly.com/uploads/1/3/2/8/132814365/guzagiziwafibep_besuko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5fe372e56c9be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469145/normal_604a35912c0c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410962/normal_6051108c03db9.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/yofxKib/best_ceramic_tiles_for_kitchen_floor.pdfIn PDF document text
    • http://frukt.fun/parks_and_recreation_streaming_saisouhuog.pdfIn PDF document text
    • https://cdn.sqhk.co/gubusase/ihIjjYU/voice_keyboard_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudalulox.epizy.com/for_honor_conqueror_pro_guide.pdfIn PDF document text
    • http://fapujeg.epizy.com/21646725085.pdfIn PDF document text
    • http://lovigolowolo.rf.gd/batching_plant_calibration_is_code.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_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 5308 bytes
SHA-256: b780dae58ff8dd0a83828b3146245944aed3ebda00093e271459495540d02139
font_01_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 12308 bytes
SHA-256: 0ff11c9b60450877c5f0dd49433c0a4fc885021f27662d38bfdfa14fec0df640