Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85b9b7faba770f5…

MALICIOUS

PDF

70.9 KB Created: 2021-02-15 19:37:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1d76fa00d80dfc1d77c93b8bda04adb1 SHA-1: 8b2ed326ead8d3d9427b833b580b4fdc8af5d948 SHA-256: e85b9b7faba770f5543a4690c74c9c13b0d4a69fb7df8bbbdf4673b5f43ebda7
184 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'crophysi.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure designed to redirect users to potentially harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=jcpenney+deluxe+sewing+machine+precision+built+zigzag+manual In PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/murumopu_zugezevabaribe_mefubebukij_bufugere.pdfIn PDF document text
    • https://losaburi.weebly.com/uploads/1/3/5/3/135322327/xusinetaxeka_zunasalipuxo_wowepunufemobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_602163f2ec904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_5fdbc2490d905.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/xejumel_senokibuw_xojen.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/db33adeb.pdfIn PDF document text
    • http://dazefoxezizu.iblogger.org/difojibumusafirer.pdfIn PDF document text
    • http://xepomujix.22web.org/kofagos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_5fea377fc6601.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/fodose/blyth_academy_qatar_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/caller_tunes_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/17628266126.pdfIn PDF document text
    • http://pugonekiwijotom.rf.gd/gondor_theme_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/wugisijogimijikuvurezi.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/29386701245.pdfIn PDF document text
    • http://nixelotiseze.epizy.com/chloroform_definition_in_english_dictionary.pdfIn PDF document text
    • http://nudenagazosizav.epizy.com/pewekavurofola.pdfIn PDF document text
    • http://tiwemevi.rf.gd/bechain_hai_yeh_dil_mera_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/covina_weather_report.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_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 5928 bytes
SHA-256: b57b89ac5ecb7c50b4838882682522dfbd717b5f7f77811b8283cf15003b02b8
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 10232 bytes
SHA-256: de8280961f58737d06729762a6b8a54d1db567c739e5ae445d3ae359f11de5f1

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