Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f238db3cdd36db…

MALICIOUS

PDF

76.3 KB Created: 2021-04-11 00:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7cd0d4913bd71147b4428acb1d6f36d0 SHA-1: ef0efdeb91ef02b98e904839d0a63e48af5cfc66 SHA-256: b7f238db3cdd36db2d843a7833fdec9cc21de613fdff34d40ebbf42d215a46fb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to distribute more PDFs. One prominent URL, 'https://fokemale.ru/strik?utm_term=pneumonia+sepsis+icd+9', suggests a lure related to medical information to direct users to potentially malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://fokemale.ru/strik?utm_term=pneumonia+sepsis+icd+9 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fe0f1a6924c9.pdfIn PDF document text
    • http://xekumaluvox.iblogger.org/kuzabobexa.pdfIn PDF document text
    • http://strahuemsya.info/virtual_villagers_origins_2_chapter49ygg.pdfIn PDF document text
    • http://koreatop.ru/justin_timberlake_sunshine_in_my_pocket_song_lyrics2wrwb.pdfIn PDF document text
    • https://dobuzitususuv.weebly.com/uploads/1/3/4/4/134470967/kobubanonamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fdfa041732e7.pdfIn PDF document text
    • http://vkysnaya-eda.site/bio_rad_cfx96_user_manual3z8dj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5ff834a505016.pdfIn PDF document text
    • http://snapchat-alert.com/833286771822y5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_605f639c6b372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_5fda8dfeb6eba.pdfIn PDF document text
    • https://likudone.weebly.com/uploads/1/3/4/6/134681098/2552981.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/suximawo/36199051139.pdfIn PDF document text
    • http://kafudunafow.epizy.com/16227165580.pdfIn PDF document text
    • http://seposelub.rf.gd/angielski_b2_podrcznik.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/uc_browser_android_proxy_settings.pdfIn PDF document text
    • http://nizamazibenu.rf.gd/checkpoint_ccsa_r77_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/casio_illuminator_wr100m_price.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/is_the_invisible_man_on_netflix_right_now.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/comcast_email_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/seven_spiritual_laws_of_success_list.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/free_piano_sheet_music_sites.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_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 5248 bytes
SHA-256: 88505524db071f5f89425aefe38af0c3d89360d7cadcf952759d265f83fc07a8
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10280 bytes
SHA-256: c118644d2dbaeebf009f6c5dc51512eb50ef392424db9e3b2e89af1f5dcbba26

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