Malicious PDF — malware analysis report

Static analysis result for SHA-256 af440ff7243ce22a…

MALICIOUS

PDF

82.4 KB Created: 2021-02-04 07:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 242809ef102478645f0ea9eeff437ffb SHA-1: 2ec17ceae22065eefdba3b7f39105ae007bd70ed SHA-256: af440ff7243ce22abd48fe4068ca5bf685ba8bde373eb83d9fd60d88391cc0fb
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though partially corrupted, suggests a lure related to interview questions. An embedded URI points to a suspicious URL, likely used to deliver a secondary payload or conduct phishing.

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://bologen.ru/wb?keyword=brain%20teasers%20interview%20questions%20with%20answers PDF link annotation
    • http://pomurofame.iblogger.org/12321512729.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/jbbK6JS/godanabogilasexogele.pdfIn PDF document text
    • http://nuwiratuzitezep.22web.org/heineken_malaysia_annual_report.pdfIn PDF document text
    • http://gitilapen.66ghz.com/2889958522.pdfIn PDF document text
    • http://fupomogusi.22web.org/steam_games_free_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/iggric1/impossible_track_sky_bike_stunts_3d.pdfIn PDF document text
    • http://bilapak.66ghz.com/agnisakshi_movie_song.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/gx3gjja/slot_cars_sold_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/a6ghBgi/jadinumubizasokimit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rafiralexezol/lenaperosigo.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/capteur_de_mouvement_avec_arduino.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/fuzemovomexirapavoduv.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/cisco_webex_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/aikido_wrist_lock_techniques.pdfIn PDF document text
    • http://gubojudojo.epizy.com/toperaloji.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/57342848243.pdfIn PDF document text
    • http://vadibezodaxilez.rf.gd/implosion_never_lose_hope_gameplay_android.pdfIn PDF document text
    • http://juvuzonowokogu.rf.gd/65211009487.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/keluw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 4952 bytes
SHA-256: c9a4815d37e362346ae6f9ca6c46c95be139a003cea8221049318672b3e70893
font_01_sfnt_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 10644 bytes
SHA-256: 9a925bcb4a2e362710e32eb63e1a20e5c6c597221b7312ef9441a51a2073e030
font_02_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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