Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb67f46cd49f5fc…

MALICIOUS

PDF

77.5 KB Created: 2021-03-10 20:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 88b9d91d14492d69a6d3a61bb5c991c8 SHA-1: 5f06ab742a34ac652f9d5d0c679444827f7a7730 SHA-256: 2bb67f46cd49f5fc4a578418782b5d991e613df36ceeceb3baa06d3276a4d038
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to "Mcgraw hill answer key grade 9" to entice users to download further malicious content. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=mcgraw+hill+answer+key+grade+9 PDF link annotation
    • http://smcjd.com/968477834126kn6i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5fefe6b16d0e1.pdfIn PDF document text
    • http://freefire-gifts.com/connect_canon_printer_mg3520_to_wifi8wqwp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_60136f068991b.pdfIn PDF document text
    • http://vertitribe.store/42383677786wjf80.pdfIn PDF document text
    • http://koreanluxe.com/5147266321784125.pdfIn PDF document text
    • http://remontlegko.info/juju_on_the_beat_download_mp310e9x.pdfIn PDF document text
    • http://natlegend.space/imdb_girlfriends_guide_to_divorce_coachmsru8.pdfIn PDF document text
    • http://megahit.space/canadian_immigration_form_imm_0008a66eb.pdfIn PDF document text
    • http://lesantyqas.online/army_jrotc_drill_teamxe45s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_13d84cc6b98c43b8ad8f0f90e3281921.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xajowu/basedekoguses.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/5226438854.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_c8315eff23f64927b6f2952e0e749b2a.pdf?index=trueIn PDF document text
    • http://femudabobizad.rf.gd/weber_spirit_e_210_replacement_grates.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/zoom_g1on_patches_u2.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/playstation_vita_tv_gamestop.pdfIn PDF document text
    • http://fevejalamozek.epizy.com/automate_android_premium_apk.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_6d6301f3ae604704b74c29ee32349e5a.pdf?index=trueIn PDF document text
    • http://subedawulowuwo.epizy.com/chloroform_well_contamination.pdfIn PDF document text
    • http://begosene.epizy.com/15812878607.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_e925cdab6718443aa33bd0048597aac3.pdf?index=trueIn PDF document text
    • http://jeduvuvojupan.rf.gd/wewuridadivosumug.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_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 5620 bytes
SHA-256: 704e0c7db629dfc4a381982c6b6f808702de675cd15af08c619d79e003f3a7a8
font_01_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 11036 bytes
SHA-256: af0f203b1d5609e9691481ce0b589438be80ff78a037c9749d6b7a24d9715800

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