Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90690fc35c6e924…

MALICIOUS

PDF

87.6 KB Created: 2021-03-14 13:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c4e3896bbc209926536077b39b6293 SHA-1: 85bb2dce8ffc214cb6e7fe90a843f92666b2c65d SHA-256: e90690fc35c6e924a46da08cb8a8d0b6376dc208e4b9840ee3ecd4394c4acc3c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to job search terms, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=cloud+devops+engineer+salary+in+canada
    • https://cdn.sqhk.co/xurajalijok/gOiiieW/ruzutoropet.pdf
    • https://cdn.sqhk.co/noxisoture/igejedw/dual_monitor_tools_windows_7.pdf
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/kigekosizidujebotunu.pdf
    • https://cdn.sqhk.co/jivumigen/idswy2z/52026515991.pdf
    • http://ziduzuraxiralet.iblogger.org/the_fifth_wave_book.pdf
    • https://cdn.sqhk.co/vemikozoj/TkQeJ99/60_parsecs_game_free.pdf
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/9859139.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_bb5578ffff034ba7bf125a039bcf1e6f.pdf?index=true
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_8a09a9b842d442119ae4f3b5756eba3c.pdf?index=true
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_e26266f765c448bba7f634ac0a5474e1.pdf?index=true
    • http://dajizipazubeva.epizy.com/anari_movie_song_free.pdf
    • https://s3.amazonaws.com/bejeseja/bepiwevolilifosoridurefu.pdf
    • https://s3.amazonaws.com/rotowan/excel_vba_set_current_worksheet_as_active.pdf
    • https://uploads.strikinglycdn.com/files/4f4fc8d7-521b-4fb3-941a-fe0956527c6b/82343228657.pdf
    • https://s3.amazonaws.com/gozilum/how_much_are_harvey_water_softeners.pdf
    • http://gebetipuraxos.rf.gd/36559624218.pdf
    • https://uploads.strikinglycdn.com/files/b754ff3b-577c-4725-8abb-51e80bcceadd/are_mitre_boxes_any_good.pdf
    • https://s3.amazonaws.com/minaxigevani/brampton_transit_map.pdf
    • https://s3.amazonaws.com/wozowuledij/securecrt_32_bit_full.pdf
    • https://uploads.strikinglycdn.com/files/44b81168-53b7-4f30-8f8e-8713746913c7/79896512334.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33e.bin
4d37d8be8deb1c85ccf74d2701d0b92204f476225276838f48a1dcedfc409173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 5228 bytes
font_01_sfnt_off00010519.bin
ca5ff57b309f198f694f45e2d9f811ff59172339c36d662efb461a952b025160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 11620 bytes
font_02_sfnt_off00012d0a.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 16164 bytes
font_03_sfnt_off0001421f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1421F 4324 bytes

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