Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bd88ed45382c1f…

MALICIOUS

PDF

80.7 KB Created: 2021-03-28 19:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf154914ed81a5a018e78be96f372fe2 SHA-1: 52137f9ea18d74cbc3cbb879cd79d7143cefe82f SHA-256: 74bd88ed45382c1f9e5851135886495c9d47234826c2ca952e8b86c4a00837c2
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that lead to potentially malicious websites, as indicated by the ML classifier and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', aiming to trick users into visiting these external resources. The presence of external URIs and the overall detection by multiple security tools strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=crisis+civil+war+and+reconstruction+answer+key
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/suviwufexev-nalabul-wotudufofofa-veneba.pdf
    • https://pebuzifidam.weebly.com/uploads/1/3/2/8/132815752/moradigizoboma.pdf
    • http://joxuwevu.iblogger.org/komozavubugagatujuzo.pdf
    • https://dirovobu.weebly.com/uploads/1/3/5/3/135319654/mibavam.pdf
    • http://tanubujurutemut.scienceontheweb.net/gramtica_comentada_com_interpretao_de_textos_adriana_figueiredo.pdf
    • http://zakukat.iblogger.org/ark_survival_evolved_mod_menu.pdf
    • http://fibilif.iblogger.org/poodle_dog_breed_information.pdf
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/salovarifuko.pdf
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/gatedo.pdf
    • http://mokugujumekov.sportsontheweb.net/atomic_force_microscopy_for_biologists.pdf
    • http://pekuxareja.22web.org/plant_breeding_dictionary.pdf
    • http://zofapojofiwifi.iblogger.org/lakatafumovonotasifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nofalowi.rf.gd/vakebuzawevoxokumipepek.pdf
    • http://widabuve.epizy.com/fsa_algebra_1_eoc_review_answers.pdf
    • http://pimoxonevuwewax.atwebpages.com/94863401042.pdf
    • http://gulagopafed.onlinewebshop.net/complex_algebraic_equations.pdf
    • https://s3.amazonaws.com/wovigebi/reddit_must_have_android_apps_2018.pdf
    • http://fadosidenisuko.epizy.com/xulubatiwamevojuse.pdf
    • https://s3.amazonaws.com/gawabog/70672488444.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08d.bin
a94e603ec6463f92674beb623ffe606510a690e7f249f5538713a9cce04df59a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 5156 bytes
font_01_sfnt_off0001023c.bin
d1da2eecf3d7928f3c4a9bdf1566bcd884d4a2347350192fb759729e34a601fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 10980 bytes
font_02_sfnt_off00012775.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 4324 bytes