Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90d14912f7786dc…

MALICIOUS

PDF

88.6 KB Created: 2021-04-07 05:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c05a4501b0cedf6b7bacc830d338c8d SHA-1: f69dc51afe7354eb9761c5ecda94bf6d19931fac SHA-256: a90d14912f7786dc5d4d912ae45f34b6b59b3bc381ddaf1600a33d388c0b55bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified suspicious and invisible links pointing to domains associated with link farms and potential phishing lures. The PDF document's structure and embedded links suggest it is designed to trick users into visiting malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6786

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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
  • 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://crophysi.ru/award?keyword=map+of+the+united+states+with+capitals+pdf PDF link annotation
    • http://vk-settings-change.online/61484209506qjkjr.pdfIn PDF document text
    • http://uscarinsurance.info/balivajanezimiguferas252s.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/2gdg5jj/laxipapunexuzilolikap.pdfIn PDF document text
    • http://erkutungotu.com/how_to_read_a_book_the_classic_guideqmmxm.pdfIn PDF document text
    • http://bnl-jobs.com/ipad_mini_2019_vs_ipad_pro_2020tuhv7.pdfIn PDF document text
    • http://kmikaerfs.ru/6005628985915g9h.pdfIn PDF document text
    • http://com-login8.xyz/ledefakenakuboiw8dd.pdfIn PDF document text
    • http://dontbeshy.xyz/flowchart_in_ppt_templatevb9yx.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/mifEhhT/delicious_crockpot_recipes_with_ground_beef.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/42785757040f6kov.pdfIn PDF document text
    • http://kefovatoxag.22web.org/free_telugu_astrology_book_download_birth_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/7ghjkje/word_of_the_day_for_middle_schoolers.pdfIn PDF document text
    • http://makamar.tech/gogotiwufr67bc.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/2jfjjSp/80270247877.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zamutodud.rf.gd/how_to_activate_the_pandemic_ebt_card.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/hd_movies_free_for_pc_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/assignment_format_university.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/schindler_s_list_sheet_music_clarinet.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/arden_s_theorem_example.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/rebudetoxifer.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/going_the_distance_2004_parents_guide.pdfIn 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_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 5244 bytes
SHA-256: aa84517beb7e2757a5d3a13aefa10608a4f712fa5b5457420dac8a867307d851
font_01_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 11956 bytes
SHA-256: 9da5cd245c8e0427f6e4bddfb15eb7b8de1d2006922433fdfe40f3a69edf15c3

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