Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47a71071743075f…

MALICIOUS

PDF

81.1 KB Created: 2021-04-04 09:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8efff4457f52bdf44e3e60c4e41b486a SHA-1: 66927f2e84cceb5fb76a6c18b449194af97016b2 SHA-256: d47a71071743075f75f68ff5fd6580bbcc5218510657ee6356503c453cb2fa12
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('golowaki.ru') and another to a link farm ('cdn.sqhk.co'), suggesting it's designed to redirect users to malicious sites. The PDF structure and embedded links are characteristic of phishing or malware distribution campaigns.

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
  • 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://golowaki.ru/strik?utm_term=how+to+clean+my+gas+fireplace PDF link annotation
    • https://cdn.sqhk.co/jomonufo/jihb5HN/luck_movie_songs_mp3_download_320kbps.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/bfidLhc/zumur.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/enH9yxt/old_fashioned_recipe_sugar_cubes.pdfIn PDF document text
    • http://zefikono.22web.org/allen_bradley_rslogix_5000_training_manual.pdfIn PDF document text
    • http://tipopajokoti.iblogger.org/vocabulary_words_for_6th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/bogijifaviba/tjdqxjg/mezutofoj.pdfIn PDF document text
    • http://arthromedshop.xyz/kegofasupexox4xg.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/gh0jeR1/nokia_sms_remix_ringtone_download.pdfIn PDF document text
    • http://cyberlife.store/frase_di_chiusura_lettera_commerciale_in_inglese8c15f.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/qhaOgef/kansas_city_chiefs_running_game.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/Qgigegi/84858144415.pdfIn PDF document text
    • http://samettemiz.xyz/howls_moving_castle_wallpaper_hd_phone5bdfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugejaf.rf.gd/soundlogic_light_up_rechargeable_wireless_bluetooth_speaker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/poxot.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/keystone_pipeline_map_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/prezi_able_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/karcher_power_washer_2400_psi_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/relibidunape.pdfIn PDF document text
    • http://minofadejewezup.rf.gd/99091659263.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_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 5488 bytes
SHA-256: c1a6c1bbb138868799f8a289943b0744f7b722a521ae0a1134a70ccc92596ee7
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 10716 bytes
SHA-256: 819c64fe2c703c5b362089307b6a053254ff76bc5bd161690c95e26bfd1ea41f

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