Malicious PDF — malware analysis report

Static analysis result for SHA-256 a116d37fa7c7d0af…

MALICIOUS

PDF

72.7 KB Created: 2021-02-21 18:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6a74ad17381cb34ef53720bdbdbe4605 SHA-1: 8a8acc58d59da8c4106f00a066e5bd8964aff5f7 SHA-256: a116d37fa7c7d0af706ddebd3717ff72e3caa59303760f50cace172ec7b0f6e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of an SEO poisoning scheme to trick users into downloading malware disguised as study guides. The presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=cwna+107+study+guide+pdf+free+download PDF link annotation
    • http://probmaka.tech/90110729235hlabp.pdfIn PDF document text
    • https://dikivofugejal.weebly.com/uploads/1/3/1/4/131453076/3090030.pdfIn PDF document text
    • http://zalavsky.ru/nulimegisqca6.pdfIn PDF document text
    • http://redit.fun/aoa_full_form_in_societykxd70.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/satedeguris.pdfIn PDF document text
    • http://rusakova.space/fisufozegakoxqgg01.pdfIn PDF document text
    • http://helpverifedbadges.com/lost_at_sea_activity_answersn3r0o.pdfIn PDF document text
    • http://copriyghtconfirmed.com/sri_lakshmi_stotram_in_teluguysh3x.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/47836855814pkh9.pdfIn PDF document text
    • http://natnat.fun/barry_eisler_el_destacamento_e-los_l9bsjp.pdfIn PDF document text
    • http://topsalon.xyz/mg_g_kg_worksheet1qaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilipomijovum.epizy.com/the_secret_life_of_pets_2_rooster_plush.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/satyanarayana_biochemistry_textbook.pdfIn PDF document text
    • http://tivurazug.rf.gd/python_3.4_3_for_windows_7_64_bit_free_download.pdfIn PDF document text
    • http://rawuzogese.rf.gd/xabep.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/game_bandicoot_kart_racing.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/zavigekokowenat.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/84715298155.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/59242592860.pdfIn PDF document text
    • http://xobekorafoza.epizy.com/parallel_and_perpendicular_lines_worksheet_grade_7.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_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 5584 bytes
SHA-256: 7e5aef11078feb619308fa165a1b355cf7e5fc697ebdd212192280a10c5c5115
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 10792 bytes
SHA-256: eb9a3ee1f708d088042db2d90d9a4a6fbe19ab76c61b42efb961faacbbb0f14f

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