Malicious PDF — malware analysis report

Static analysis result for SHA-256 c888c99f11f92c33…

MALICIOUS

PDF

71.8 KB Created: 2021-03-17 21:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3dcb51be17e4ce5686197cbbff68270b SHA-1: 54b864f27752011e07270f97406ad9e71a24b4ab SHA-256: c888c99f11f92c3347e2cd1602fee248ee3dfdd0cb141d1fd766c6ab6815a4d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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=verb+to+be+affirmative+form+exercises+pdf PDF link annotation
    • https://fufilotaniwa.weebly.com/uploads/1/3/5/3/135321354/9775314.pdfIn PDF document text
    • http://wisajekunitope.22web.org/find_volume_of_composite_figures_lesson_11.12_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/ibhew6r/bluetooth_software_computer.pdfIn PDF document text
    • http://legobibeli.22web.org/revedadowodeneweponur.pdfIn PDF document text
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/7634665.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/70876567451.pdfIn PDF document text
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/4107540.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/hm49FYz/dubovagimafuti.pdfIn PDF document text
    • http://pawosevisipe.iblogger.org/65540453904.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/syllogism_rules_bankersadda.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/95549813010.pdfIn PDF document text
    • http://dazenad.iblogger.org/dejar.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/tuzesoje.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/pYkW0hh/dead_man_walking_undertaker_theme_song_lyrics.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/principles_of_bioreactor_design.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/gegi4gj/la_vie_en_rose_traducao.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/4730882.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/vjbphhj/birk_s_adventure_walkthrough.pdfIn PDF document text
    • https://xirojanolaxoz.weebly.com/uploads/1/3/4/7/134723589/1115639.pdfIn PDF document text
    • https://garugufalavul.weebly.com/uploads/1/3/4/5/134507034/6869712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/08139477-d198-4f8c-85f7-ee7cd3d30583/ap_1_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e5689d-3048-42c3-a54e-b6eaf67ea5c8/how_to_be_a_3_man_free.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/44248876009.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 5500 bytes
SHA-256: 290e1c6315a4de385baf16c8377b4370f58020af01a3b288090d02550b76f94b
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10856 bytes
SHA-256: e3e1179364fdbb2b16334f066ad469b32ee563d838732c558377abe0df01606c

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