Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6e422a8725e578…

MALICIOUS

PDF

75.4 KB Created: 2021-05-12 08:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28883b9c098ff3d972dcee5ea78e18b9 SHA-1: 4132685f1ff1a90ac0a0260435693ab6a7a147c0 SHA-256: 7c6e422a8725e5786ab8433d885d0554a3eb40f749c232c231e3b27fd59bcd3a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=congruent+triangles+sss+sas+asa+aas+worksheet+answers
    • http://8bitbeardsco.com/onkyo_tx_nr809_manualk4ynn.pdf
    • https://miwunogix.weebly.com/uploads/1/3/2/8/132814940/xixuzugarozu_rijozas_wizabuvumufeju_wamiro.pdf
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdf
    • https://lefazevi.weebly.com/uploads/1/3/0/8/130873710/devedexekodor.pdf
    • http://sisogelodaze.medianewsonline.com/the_count_of_monte_cristo_short_version.pdf
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/zavuvudaz-nawunobivu-zuwob-linefodetat.pdf
    • http://chatik85939775.fun/175468821709xn8t.pdf
    • http://bigtittybella.com/axiom_pro_49_software_download5mmw0.pdf
    • https://cdn.sqhk.co/denirinodo/iaIjcfB/bevipopofivu.pdf
    • https://cdn.sqhk.co/zakolemafemo/yjjt0l9/bemowuzipofinijav.pdf
    • http://suzamajotibe.mywebcommunity.org/waler.pdf
    • http://giwewigipebi.medianewsonline.com/81676611477.pdf
    • http://javaxirivibewi.mygamesonline.org/sefamojigenex.pdf
    • https://wuwilosuz.weebly.com/uploads/1/3/4/3/134394730/72ebd5b3f362884.pdf
    • https://cdn.sqhk.co/japivuwali/Qxifjan/yalla_free_voice_chat_rooms_download.pdf
    • http://vikiduxa.mywebcommunity.org/solve_simple_equations.pdf
    • http://pepariravifaza.getenjoyment.net/what_can_a_crp_blood_test_show.pdf
    • https://cdn.sqhk.co/bulixanejad/iwhgFif/56105925029.pdf
    • https://pawapuso.weebly.com/uploads/1/3/4/3/134312868/9467563.pdf
    • http://help-bluebadgecustomer.com/cloud_9_store_locationsx4fkj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gaxilitexu.onlinewebshop.net/duzupamewetewege.pdf
    • https://uploads.strikinglycdn.com/files/3d40b5b4-42c7-43fb-8804-129007d16454/brother_mfc-490cw_wireless_setup.pdf
    • https://uploads.strikinglycdn.com/files/f4f1f76e-1e72-4ad9-b1be-ddc09dc28d0c/la_divina_commedia_italiano_moderno.pdf
    • https://uploads.strikinglycdn.com/files/128faea6-2309-425c-8229-bbe9248629aa/casio_ga-100-1a4er_g-shock_alarm_chronograph_watch_-_w1502.pdf
    • https://uploads.strikinglycdn.com/files/c627be3d-79b2-4601-a7bf-1f08fd78fe55/what_is_the_summary_of_the_hunger_games_catching_fire.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_off0000e8c9.bin
789c03d3c7a2c033723ab2f18de9de69ca071d144cf56911ac8805255dff7046		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 5008 bytes
font_01_sfnt_off0000f9de.bin
cfa49685d4bd80671fe4dc70c740aab7e631b9eb16d33326ae92ee21b3f22e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10612 bytes

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