Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70e719eff05613c…

MALICIOUS

PDF

82.7 KB Created: 2021-05-11 06:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 231ea2b4e168f66c6666e7f32dc212b9 SHA-1: f8eb65865777f33237bff30d4f05697c8f085119 SHA-256: a70e719eff05613c015e0a3be3a74196f449e4b61f526a7b61d8aa1682a81802
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains multiple external URIs, with one pointing to a suspicious domain 'vilenefex.ru' which is likely used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to device troubleshooting, aiming to trick users into clicking the malicious link.

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://vilenefex.ru/strik?utm_term=what+to+do+when+your+acer+tablet+wont+turn+on+or+charge PDF link annotation
    • http://jixagosetevef.22web.org/que_es_el_analisis_dafo.pdfIn PDF document text
    • http://filmera.ru/what_does_godfather_mean_in_the_bibleh8c9d.pdfIn PDF document text
    • http://vikorurapufor.iblogger.org/carabidae_identification.pdfIn PDF document text
    • http://morikulifitoj.22web.org/psd_file_tri_fold_brochure_template.pdfIn PDF document text
    • http://mizigigutafax.iblogger.org/variedades_de_cafe_en_guatemala.pdfIn PDF document text
    • http://reliables.ru/5095232874qcavi.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/61958bd4-1c68-47f2-8a84-b8cb220618af/what_is_the_smallest_gene.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/journal_citation_reports_2018_sociology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc3a3cb-f7a8-47ce-a00f-e83d208e3b8d/how_to_find_an_affordable_interior_designer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef9e64a-ac66-4be1-b02f-ca08329026d6/52121778955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2955a6-4d6b-4b7f-add7-c6dbba2e2524/3275303523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aeca062-137c-4566-95c6-e3283580ade7/arcsoft_showbiz_5_download_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1126445-92d4-4139-9901-4c21191f63df/why_does_my_weight_watchers_scale_keep_saying_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb836b2-5313-4b67-bbc9-663da96f9a95/ruwanelen.pdfIn PDF document text
    • http://zanutebuxeboluv.rf.gd/android_player_forum.pdfIn PDF document text
    • http://pivomowofafo.rf.gd/agammaglobulinemia_autosmica_recesiva.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/creative_sound_blaster_x-fi_surround_5.1_pro_usb_audio.pdfIn PDF document text
    • http://zoregok.rf.gd/87752742715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf3b29c-cd65-4e59-a105-ec379d6fa364/troy-bilt_tb30_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2285c1-a9aa-4123-aeaf-4c2d4c4d39c0/how_to_play_poker_with_2_players.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_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 5372 bytes
SHA-256: b14cbc49407e1b8fd49643bfeadaedc14a29e2215737d7af77abe26460443927
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 11092 bytes
SHA-256: 986b5378f8be905b4aaf265d9b7a326d362c094a199f4ccd26c88508352bdc28

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