Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52f3c33b67705b2…

MALICIOUS

PDF

73.7 KB Created: 2021-02-12 02:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3f3bb00d4f527eef4fc74fef4c44006b SHA-1: 84d745477f71e0333eccf55f658f4881b42bdc22 SHA-256: a52f3c33b67705b25b6824c786a5e37c1e83d0a08d89c27f7a1d57b5dace015b
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/123?utm_term=fujitsu+thermostat+installation+manual PDF link annotation
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/6729796.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/ygiidji/kung_fu_heroes_nes_music.pdfIn PDF document text
    • http://strita.space/hindi_dj_songs_free_download_zip_fil3j71i.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/bgeha58/merge_tower_bots_all_bots.pdfIn PDF document text
    • https://cdn.sqhk.co/dogojaseziwo/hievifq/16735972744.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/hjgjG0v/70489359302.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/KGjgRge/flight_boarding_pass_air_asia.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/uQsjgjg/2246448291.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/9Q6Gghb/jekokavufefowuzaba.pdfIn PDF document text
    • http://get3creditscores.info/diablo_2_charsi_imbue_guide4sidp.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/luborinizu/nupaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/google_chrome_freezes.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/microsoft_analytics_platform_system_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/42383246910.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/rafobabijejes.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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 4956 bytes
SHA-256: f5d13f9c65dead3316511ea80ef00c4e1f3d76c3ac3ee6ffea7f62e3cbafc790
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 10220 bytes
SHA-256: 6db98bd7c94ec2740ca458ea50d344144e3bea79a514bb9ea99ae2a3a004c421