Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c53ebd7989b152…

MALICIOUS

PDF

70.8 KB Created: 2021-02-15 20:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd395e34ef96f34cabfb1385f14b6d45 SHA-1: 2385fd1c5561e529c968ed333a66aa1c79dbb413 SHA-256: 66c53ebd7989b152e90ba27fc09fd785689cfadfd316ed56ba45d0c2004446df
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one prominent URL suggesting a lure related to connecting a universal remote. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for SEO-related content, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or scam campaigns.

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://seumenha.ru/123?utm_term=how+to+connect+a+harmony+universal+remote PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5fdf32aececf2.pdfIn PDF document text
    • http://vezokikawelin.iblogger.org/catenae_innovation_annual_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fc71c2cb5f62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fe1d367270ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_6010ffc89f2dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_602a1c43118e3.pdfIn PDF document text
    • http://djami.ru/dobabuzuwuvozupu6h5lp.pdfIn PDF document text
    • http://retys.space/canada_immigration_applicationcvm8f.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/zubezurab.pdfIn PDF document text
    • https://megularebenava.weebly.com/uploads/1/3/1/1/131164421/ruzawigonoraja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fed3dfdd5bc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezajezo.epizy.com/reduce_size_adobe_illustrator.pdfIn PDF document text
    • http://wafitiw.epizy.com/i_ready_answers_level_d_reading.pdfIn PDF document text
    • http://kegotetebam.epizy.com/bleacher_report_nba_position_rankings.pdfIn PDF document text
    • http://napezidemilolez.epizy.com/aayush_sharma_song.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/bandwidth_limit_exceeded_jer_2019.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_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 5256 bytes
SHA-256: 60f80e9171a0f6f8899fb167e40c1a6bd40a1e15abec881b116f0ee59fe6830d
font_01_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 10536 bytes
SHA-256: 6659b0bb6e719c6d4bab8258eef50f8b63b69384f4c5bb6495a066fd6d90826c

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