Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99648d2d856ffd6…

MALICIOUS

PDF

79.4 KB Created: 2021-02-22 15:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fa59b9c28918d15f93651de66fe07456 SHA-1: 966ec0493030f2e3db1935166ae0da5c52959350 SHA-256: d99648d2d856ffd6bb31e6fd957f3eb913e5bb1ad6a5ef910ea530dacbedcb49
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains multiple external URIs, including one pointing to a suspicious domain 'baarspo.ru' and another to 'cdn.sqhk.co' which is associated with a link farm. The PDF structure and embedded content suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery. No scripts were extracted, but the presence of numerous URLs and the heuristic findings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://baarspo.ru/strik?utm_term=how+to+keep+an+engineering+notebook PDF link annotation
    • https://cdn.sqhk.co/ragojagef/ZjhNjb6/evil_neighbor_ghost_escape_apk.pdfIn PDF document text
    • http://istlan.fun/budonekinene9r72v.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/companionship_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/2gjTrcl/gachi_in_space_idle_rpg.pdfIn PDF document text
    • https://cdn.sqhk.co/mesodimeduje/Khh32Po/credit_card_chip_fallback.pdfIn PDF document text
    • http://bepevekebezupu.22web.org/learn_python_programming_step_by_step.pdfIn PDF document text
    • http://tafelutij.22web.org/lemon_drizzle_cake_bbc_good_food_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zazifutunoj/eS9Pjhr/kutibakaberipirini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waxapoz/engineering_lettering_guidelines_2_4_4.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/app_store_not_ing_on_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/57032133122.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/anydesk_android_black_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/pevikonatasu.pdfIn PDF document text
    • http://pikiregofi.epizy.com/get_used_to_exercises_with_answers.pdfIn PDF document text
    • http://wuzonovow.rf.gd/60845423477.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_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 5032 bytes
SHA-256: 0ef43dbf161f35803f379daa3b0e0ee477322e70cac20c1d4b3b21a9e3a3d0b9
font_01_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 10736 bytes
SHA-256: 5a805dcc970ed6f09a42401436f1e1e817ab2b5ab8f6f993520e61c88b21ae2d

Open this report in the interactive analyzer, or submit your own file for analysis.