Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fafc2f4d500cee2…

MALICIOUS

PDF

73.0 KB Created: 2021-03-06 23:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 97d977218a0e1d5fc845abcc5e10f86c SHA-1: bcb2360b6d839c430cf4146c64a8ae20ce01bf41 SHA-256: 7fafc2f4d500cee20e82810687c59f5ceba4c842ea651e7ce375c8ff280c0fc6
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 hosted on disposable domains, indicative of a link farm. ClamAV and ML classifiers flagged this as malicious, specifically a phishing trojan. While no scripts were extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

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://zajinet.ru/wix?keyword=pennridge+school+district+elibrary PDF link annotation
    • http://joxuwevu.iblogger.org/8_parts_of_speech_meaning_with_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/7ghgCgi/best_drivers_in_nascar_2019.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/conexant_hd_audio_driver_windows_10_download_hp.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/jagiQjj/fruit_cut_master_apk.pdfIn PDF document text
    • http://suberubepuparo.getenjoyment.net/62675823780.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/e00gW62/call_of_mini_dino_hunter_hack_ios.pdfIn PDF document text
    • http://muritolovaj.iblogger.org/zejumirugobakap.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/vojupizom-farijesifu.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/does_dunkin_mocha_swirl_have_dairy.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/fire_and_ice_facial_cost_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/revogonesox/dgehgjb/boomerang_di_instagram_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/iatiggi/kirogojaxazavewemobeg.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/hchjge0/warzone_pubg_tournament_app_download.pdfIn PDF document text
    • https://dodizavezoku.weebly.com/uploads/1/3/1/3/131398251/liwutibagejapov.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/five_languages_of_love_summary.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/9930745.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/icgdidk/recorder_songs_notes_b_a_g.pdfIn PDF document text
    • http://waliwosodumobu.iblogger.org/nutifood_vietnam_annual_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girofili.myartsonline.com/96649490185.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/how_to_clean_aloha_breeze_32_tower_fan.pdfIn PDF document text
    • http://mideravedikow.rf.gd/21032200411.pdfIn PDF document text
    • http://nakixaxev.myartsonline.com/garmin_forerunner_620_watch_band_replacement.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/zowaju.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_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 5444 bytes
SHA-256: 63d2d2ee611d7ffef47c4209ae1bdb050e06c1bdf9c01856e37f14bd9acb08ad
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10856 bytes
SHA-256: 4fbd146ae624fdeddc832fa668999f819f41121adfa530a30acd4b2d8242dc9d