Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ee92a4e4a7905e…

MALICIOUS

PDF

73.7 KB Created: 2021-03-15 22:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3d511350faa4d2f9892caa90e12864eb SHA-1: 792808737610e859e5a9dde3c721f91b610ecbcc SHA-256: f4ee92a4e4a7905e45fc577e2d11849aa7d4b370f4c9ed4948a8403f33a495f6
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to a redirector URL (https://fokemale.ru/wix?keyword=shear+wall+design+etabs) which is part of an SEO link farm. This suggests a phishing or malware distribution attempt, masquerading as legitimate content. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=shear+wall+design+etabs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417645/normal_6024a48fe3830.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/auto_entrepreneur_maroc.pdfIn PDF document text
    • http://denarop.22web.org/ethical_hacking_training_institute_in_kolkata.pdfIn PDF document text
    • http://jogemijafiw.22web.org/32035003481.pdfIn PDF document text
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/zokot.pdfIn PDF document text
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/1a1260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446388/normal_6026e95a1df1c.pdfIn PDF document text
    • https://benadegerabo.weebly.com/uploads/1/3/0/8/130874398/domovuw-tejavuradevimef-tuberepizimir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451348/normal_601a29dad2509.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/lezerawe/64904247016.pdfIn PDF document text
    • http://seralugaba.epizy.com/88854778536.pdfIn PDF document text
    • http://xedemigu.atwebpages.com/hush_little_baby_man_song_meaning.pdfIn PDF document text
    • http://roveramo.atwebpages.com/programming_in_c_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/what_is_peak_vertical_ground_reaction_force.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/live_tv_apk_for_firestick_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/dupojexetakaberozupa.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/gapomovum.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/at_t_4g_lte_and_upload_speeds.pdfIn PDF document text
    • http://nonogopikizezed.rf.gd/asp.net_tutorial_mvc.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/15965980448.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_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 5420 bytes
SHA-256: 392b6f6f568faa30dda58f318d252aa07d2fd98fe544d69462f5a819e2f6dea4
font_01_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 10484 bytes
SHA-256: b4dfea6ec566455654b09357dcc60bda7cbe957814eb40d4af139d508f21d89b

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