Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd921216082a26d7…

MALICIOUS

PDF

93.6 KB Created: 2021-03-16 13:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 42cca7a42522ad38d7564abf807e31c6 SHA-1: eebc9995aefeaeaddfa380cd1fb7325d163ab87e SHA-256: cd921216082a26d7d55721d57b38d194aebc8f53a7898325084cd1e381eaf7e5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/strik?utm_term=information+technology+stocks+that+pay+dividends PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445333/normal_604b12e28e421.pdfIn PDF document text
    • http://all-gopro.com/jutapixirapiwozumovaxiqds.pdfIn PDF document text
    • http://fiwadewemizoti.iblogger.org/78157001736.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/castrol_magnatec_diesel_10w-_40_b45re10.pdfIn PDF document text
    • http://cardioactiveufficiale.site/what_skills_are_required_for_managers3pu7i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_6028faff46c45.pdfIn PDF document text
    • http://tersq.fun/boy_erased_watchabdug.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/tusifuda.pdfIn PDF document text
    • https://xorataseturife.weebly.com/uploads/1/3/5/3/135333409/tejuri.pdfIn PDF document text
    • https://juxosejuw.weebly.com/uploads/1/3/4/4/134481686/ae806374de6f54a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fe1ab2f5ce29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_b170ec444b5640ffa44e104e39ed660f.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_0ceee8a36f9c43759cc403d0504714b0.pdf?index=trueIn PDF document text
    • http://fefaborap.rf.gd/short_moral_stories_in_hindi_for_class_8.pdfIn PDF document text
    • http://redotikami.rf.gd/zugudixefefakozomagupewa.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/bengali_new_movie_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/how_much_money_does_starbucks_employees_make.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_92f00bc6d549421d8960b329a21aa70b.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_1a56c58877534a16b594342ee1e9a9ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/25669777507.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_b385ac1b0db54af8997ff92afe315f2c.pdf?index=trueIn PDF document text
    • http://vitewunidamol.epizy.com/fiwezurok.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/surah_mulk_full_pic.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_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 5732 bytes
SHA-256: 20aa4fc5dbdc09a9bff242b424e63fd6d5ce1d3dc2199ef8c638e2eb8e0990ce
font_01_sfnt_off00013fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB1 12076 bytes
SHA-256: 39324e784fa2884e3a47827b0a18f54a4479cd2da81e5cb03eb1e06f6827bc0e