Malicious PDF — malware analysis report

Static analysis result for SHA-256 623b0c1550fa6c22…

MALICIOUS

PDF

69.5 KB Created: 2021-03-02 09:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 19e521f1a609ed9eea058bb2ee6f7e07 SHA-1: c3aebbd378d44ad0a9420d77a12d2ec3dd446213 SHA-256: 623b0c1550fa6c22a1279b74aee413780443263a576f849b34015ba223f688e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a lure to redirect users to potentially malicious content or phishing pages. The PDF structure and numerous links indicate a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=efecto+leopi+para+ellas+pdf PDF link annotation
    • https://negozikazaseju.weebly.com/uploads/1/3/4/5/134587396/fopugiwuroniso.pdfIn PDF document text
    • http://sis-paypal.com/alex_rider_scorpia_rising9halv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_6017c7fdb50e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467601/normal_5ff0320874934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_601831aadd5e3.pdfIn PDF document text
    • http://sq11mini.com/whole_numbers_and_natural_numbers_worksheett17iq.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/jfv5jb1/battery_christmas_lights_outdoor_with_timer.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/Thi0Vhg/dojepofum.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/jhhbjey/fulunise.pdfIn PDF document text
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/4231050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480880/normal_6006769c7ca5c.pdfIn PDF document text
    • https://zedijonen.weebly.com/uploads/1/3/4/0/134018258/1771541.pdfIn PDF document text
    • http://dezlice.ru/wilderness_survival_romance_novelsa8u8q.pdfIn PDF document text
    • http://arenaprobet.com/52248641927ab097.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/3177555.pdfIn PDF document text
    • http://autobaff.xyz/biwibumavewekarefanab6eae1.pdfIn PDF document text
    • https://dasifapuzo.weebly.com/uploads/1/3/1/4/131454731/93c917d77236.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/5379234.pdfIn PDF document text
    • https://wipasajumavadus.weebly.com/uploads/1/3/4/7/134775966/fefakazonebugo_dubasonekibe_kulovapajediji.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/dQ1ihdL/samirakarujibolediponu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 5108 bytes
SHA-256: 81ffe1a45f35d5a719795719ce2bf2d4bf48f0ac705e0d1fc747d751ea84a51c
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 11512 bytes
SHA-256: a5f6ab034ccbcea9678c0a29d98637784f836691aceb21fa950d6e3be3dfad0d

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