Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f4a1537e777733…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 10:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc1da18b71f400ae8d3ed5e1bb188274 SHA-1: dbeb6f0cfd34161b2ab591908bcb28ad405e8113 SHA-256: 88f4a1537e7777330be76d5082a39e354747907fbbea150b8c2a7d2292692c2b
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. The embedded URL 'https://resalured.ru/wix?keyword=mkx+app+cheats' strongly suggests a phishing or scam attempt, likely aiming to trick users into visiting a malicious site. The document body, though heavily obfuscated, contains references to 'mkx app cheats' and the authoring application 'wkhtmltopdf', reinforcing the lure. No scripts were extracted, but the presence of external URIs indicates a redirection to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=mkx+app+cheats
    • http://astropsychology.site/65270500173civ08.pdf
    • http://instahelpforbusiness.com/nejerigazuwugubikevujarabias2.pdf
    • https://cdn.sqhk.co/xumesapaxoku/c653biF/77845177829.pdf
    • http://lavkavkusa.store/speak_study_guide_answer_key0ihhm.pdf
    • http://milesnires.xyz/new_zealand_standard_curriculum_vitae_templatesgiit.pdf
    • http://micrometerdigital.xyz/27558123515yjrk6.pdf
    • http://artistichomesolutions.com/what_are_the_3_levels_of_strategy3izn4.pdf
    • http://kinoxca.xyz/craftsman_yt_3000_blade_part_number9y8ih.pdf
    • https://cdn.sqhk.co/feripamapuv/hhifsjZ/grand_alliance_death_blade_of_the_blood_queen.pdf
    • https://cdn.sqhk.co/xojelumegasi/5AppgdZ/mtg_war_of_the_spark_draft_strategy.pdf
    • https://cdn.sqhk.co/badaxiloru/XvgjWlh/20521569115.pdf
    • https://cdn.sqhk.co/gasariba/ch1ifjh/super_jumbo_world_history_timeline_poster.pdf
    • http://appletopshop.ru/8791312924vnkq0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_92824abead13458593bba0a66887861c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7fbdad32-936d-47af-a17e-4d479b045830/76981660431.pdf
    • https://uploads.strikinglycdn.com/files/06eb42aa-eea5-4290-a88a-0311a3d60621/algebra_with_pizzazz_answers_key_what_were_the_headlines.pdf
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_8ee88d6cb17741418fbaacfc9fbe03ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87917f51-69cd-4e42-9938-3a377b812f98/how_do_we_measure_organizational_culture.pdf
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_d08a06ad671a40eabaad95d628c831d0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ef1345c-8c2d-419a-98a5-a806c6679e16/fozobuka.pdf
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_75f6eef0d649476596523e03aed33656.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1846249b-d125-4517-a3f2-e8980d227f15/83103123185.pdf
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_0831dcb9fef94e878f641c95971c3e17.pdf?index=true
    • https://uploads.strikinglycdn.com/files/99062d56-7af3-4003-ba9f-3087bb560fd7/mijagola.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec65.bin
ccd7ffd10a1c308ceaffa7df8fcf3aebdc5ec693d950db6be71f75d1066ca4fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 5028 bytes
font_01_sfnt_off0000fd94.bin
c9be93a99e6ba2ec3b30705c70952f024fc9aeceee89f0fd375a317fce3e727b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10988 bytes