Malicious PDF — malware analysis report

Static analysis result for SHA-256 9348f30753e2d637…

MALICIOUS

PDF

72.1 KB Created: 2021-02-26 07:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6edf3dcc04a340be62ad78e07ec5ff31 SHA-1: 0e6a270163b13e1c609f8cdfbc552a2dec7aacba SHA-256: 9348f30753e2d63764b0fef808d6c1f0bd4b1f5f966fec27042c2b0454a6113a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites.

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://jottigo.ru/award?keyword=what+is+omb+circular+a-11 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5ff258fad19bf.pdfIn PDF document text
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/peromeviput.pdfIn PDF document text
    • http://design-kvartira.info/save_earth_2020u8m92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_602d01a60d18b.pdfIn PDF document text
    • http://websecurer.tech/13930071071q9jka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_6032393ba2ca2.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hahaMic/cowboy_bebop_episodes_total.pdfIn PDF document text
    • http://ludshop.xyz/oz_season_1_episode_2_free_onlinebobwg.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/how_do_i_start_my_bosch_800_series_dishwasher9kr7i.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/nuzokerfetgb.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/hejaGGn/marvel_legends_rogue_2_pack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_6017190e60e06.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/ijh16VL/top_10_episode_choose_your_story.pdfIn PDF document text
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/1360791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_60228985792bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejoxinivume.rf.gd/fender_frontman_25r_amp_price.pdfIn PDF document text
    • http://bukemexuladorux.epizy.com/kabino.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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 5276 bytes
SHA-256: 96a735082030aae8bd411fdce28d84a09a3da8fdeda06b064d37a31e9f975a06
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 11868 bytes
SHA-256: 10a54c237974365b3aaae95b6b1540eb714bb1ee484031ec2f97b00e33df926d

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