Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f5c6e1614588c3…

MALICIOUS

PDF

77.3 KB Created: 2021-03-03 23:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40493de14e6985f25026f70039d8896 SHA-1: 1ad4bd74bb3d7f1804fb2e3341880770de418aea SHA-256: 62f5c6e1614588c378369e73082c893f346a4b3f02ebf67ed62a4de4c51ff699
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. One prominent URL is https://pelibifir.ru/123?utm_term=what+freedom+means+to+me+essay+6th+grade, which is likely part of a phishing or content-scraping operation. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=what+freedom+means+to+me+essay+6th+grade
    • http://jewogipuwivi.medianewsonline.com/how_to_find_sim_current_location.pdf
    • http://lodomujimujug.mywebcommunity.org/how_to_use_omron_intellisense_wrist_blood_pressure_monitor.pdf
    • http://lemakomude.sportsontheweb.net/actiontec_pk5000_replacement.pdf
    • http://titonevaj.22web.org/kidibewofegum.pdf
    • https://jatupixi.weebly.com/uploads/1/3/1/3/131398141/xokumemubaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/salade/75824501989.pdf
    • https://s3.amazonaws.com/wofaxil/goduxajemel.pdf
    • https://s3.amazonaws.com/wudibirewuduto/cds_1_2019_admit_card.pdf
    • https://s3.amazonaws.com/kuxuxemu/wuviredozojamerev.pdf
    • http://tavoxelelenasi.onlinewebshop.net/amc_8_2020_scores.pdf
    • https://s3.amazonaws.com/vukusa/49752898168.pdf
    • https://s3.amazonaws.com/rimejiguvif/chinese_history_a_new_manual.pdf
    • https://s3.amazonaws.com/nojemi/dorasekulidokizoxutasep.pdf
    • http://rupegofiminatef.epizy.com/stenocarpus_sinuatus_fact_sheet.pdf
    • http://fovawipemezipu.myartsonline.com/what_is_d_meaning_of_electronic_media.pdf
    • http://tidizovebimike.epizy.com/audio_books_for_free_on_android.pdf
    • https://s3.amazonaws.com/bezorito/76913628377.pdf
    • https://s3.amazonaws.com/fofeguj/rogers_tv_guide_brampton_ontario.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_off0000f17d.bin
f0abcde1d06c0272656f44e856d323458cab4feef5b94369b13f78fb732f62ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 5560 bytes
font_01_sfnt_off00010451.bin
2ebdd86a63f88eb045c7ed0243ee5c5ebb06eb396300e56f2ffe01a19729374a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 10248 bytes