Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd9b76d74858436…

MALICIOUS

PDF

70.8 KB Created: 2021-02-16 05:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1512630f6b26fb0cd15813beca371acd SHA-1: 4bc438a0a06f2400e1fe30db93865984306bb21b SHA-256: 7bd9b76d74858436c535c2244a444c5f0f698ef05b43452cd47244c32fcd8d7a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to 'Honda civic b12 service reset', which is likely a pretext to entice users to click on the embedded malicious URLs.

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://seumenha.ru/123?utm_term=honda+civic+b12+service+reset PDF link annotation
    • https://cdn.sqhk.co/xibumediw/OVziijj/46214097704.pdfIn PDF document text
    • http://pirikulifiwitif.iblogger.org/bates_motel_5_temporada.pdfIn PDF document text
    • http://zenarajare.22web.org/44238699441.pdfIn PDF document text
    • http://lakshmi-store.ru/simple_future_will_afirmativa_negativa_e_interrogativa_exerciciosv9qtx.pdfIn PDF document text
    • http://zirekafeti.iblogger.org/homophones_worksheets_for_grade_5.pdfIn PDF document text
    • https://cdn.sqhk.co/wexazaruko/igZighh/soap_ingredients_good_for_eczema.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/7Mgfphg/funigegivavejitol.pdfIn PDF document text
    • http://gratoram.site/dragon_age_origins_blood_mage_guidenzdjx.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/oESTjgQ/gofupelibukidekizupeza.pdfIn PDF document text
    • http://prostosite.site/determine_wheel_size_for_bike_computerdnf5w.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/ggMNgh7/helicopter_2018_lyrics.pdfIn PDF document text
    • http://kittyplay.online/67896535539nqxv1.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/FQibjcb/batman_the_enemy_within_ps4_metacritic.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/cidhiBM/ping_pong_trick_shots_2_song.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/jhijggn/xesiji.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/qicAjhb/transformers_offline_games_free_download_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapivegek/vosogugipima.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/zipajo.pdfIn PDF document text
    • http://kadimupekomo.rf.gd/26653377977.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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 5244 bytes
SHA-256: cc2d0776701b050dc282536452df284c8b9e9ef6a234d1161a652e08ddc1093b
font_01_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 10288 bytes
SHA-256: 404c381713bc0f52ac9a0dbbd06c8ce3b359dcc48c5d1807e9762196eb2c22a9

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