Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dd7f0bcd8f9531…

MALICIOUS

PDF

78.5 KB Created: 2021-05-09 00:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 112d5347431d59ee3e3fdd575cd69fdf SHA-1: b02a831b05c1d886c0b71710bfc56a8cf8be69df SHA-256: 20dd7f0bcd8f95311ae237068b6ff9845ceeac3645f00f1f86c0819b19de013e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains, under the guise of a "reliability centered maintenance pdf" lure. The presence of many embedded links and the use of disposable hosting strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=reliability+centered+maintenance+pdf PDF link annotation
    • http://lexanizisujufum.66ghz.com/71093518389.pdfIn PDF document text
    • http://jasovawuke.22web.org/abduction_movie_hd.pdfIn PDF document text
    • http://xevijuwidenuxet.mypressonline.com/modals_of_ability_and_possibility_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_6052ce9d8d5fd.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/a41092ac0829fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_601f568e60d3e.pdfIn PDF document text
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/54a8e152.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/how_to_pair_sony_bluetooth_speaker_with_iphone.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/9857deb687.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/physical_chemistry_for_the_life_sciences_2nd_edition_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5fea3f81332f7.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/17039288573.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/fc881529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimekawuxa.epizy.com/40697153263.pdfIn PDF document text
    • http://binuwuzipu.myartsonline.com/betel_nut_chewing_in_the_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/magisterium_book_5_free.pdfIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/86211332555.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/drone_flight_log_book_template.pdfIn PDF document text
    • http://wivaxodi.onlinewebshop.net/26509515462.pdfIn PDF document text
    • http://ziketikivanodiw.epizy.com/chura_liya_hai_video_song_free.pdfIn PDF document text
    • http://zelimuperuna.rf.gd/how_to_resize_passport_size_photo_to_2x2_in_paint.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/78393932044.pdfIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/bible_download_nkjv.pdfIn PDF document text
    • http://kopolug.myartsonline.com/budget_and_financial_management.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/creative_sound_blaster_z_vs_asus_xonar_dgx.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/what_is_the_acronym_rice_stand_for.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_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 5372 bytes
SHA-256: e1bdfb0e526d020e86e23251155c289957ecc590a4c5cd29d5308b90201eae21
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 10800 bytes
SHA-256: 265daf9ca30de167543f20420d16a8e6de1afa3a0786ec0d68e9ceb8d680b17e