Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc15b11b831b3878…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 20:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 85759950a38ddb3f9590d0ecef1d581c SHA-1: 0f8e84d4a7f7f6c64880d23f4a333113b005d5e0 SHA-256: fc15b11b831b387840787962f9357ac800369e0cb31a1b0cec3d54c49ab5f438
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by heuristics as a link farm and by ML classifiers as malicious. The document body text, though partially corrupted, suggests a lure related to checking child support balances, which is a common phishing pretext. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=how+do+i+check+my+child+support+balance+online PDF link annotation
    • https://cdn.sqhk.co/nozelenid/f1hdgio/rofalufuvekegalewigaxux.pdfIn PDF document text
    • http://hargotel.xyz/what_are_themes_in_huckleberry_finnpvnh8.pdfIn PDF document text
    • http://kihepc.xyz/pocket_doctor_maxicarejy872.pdfIn PDF document text
    • http://fusizexa.22web.org/vobomepejaxumiwuburonego.pdfIn PDF document text
    • http://prizinsta24.space/neon_health_center_on_houghbql9o.pdfIn PDF document text
    • http://m-laskin.ru/puwesawimumetikezepikwv3g.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/jajaghd/tutodidozilutedugupojo.pdfIn PDF document text
    • http://thefortykuti.com/56273843454xj5vv.pdfIn PDF document text
    • http://livifobin.22web.org/vidmate_app_video.pdfIn PDF document text
    • http://fb-ig-violation.com/dinasofavumuduxufapqryqn.pdfIn PDF document text
    • https://cdn.sqhk.co/pipezifiwip/ijb5FdU/conduit_bending_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/hbZTgiG/repair_small_hole_in_hardwood_floor.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/hjhiBXo/46213368479.pdfIn PDF document text
    • http://nagesebaz.iblogger.org/52180218816.pdfIn PDF document text
    • http://habercigo.com/google_earth_flight_simulator_apkotci4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fb08a2-3431-460d-86bd-1fea53cedae5/oxford_picture_dictionary_english_spanish_download.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/dilixekoxibe.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/xetujesixusim.pdfIn PDF document text
    • http://rowodebifofida.rf.gd/gadejixasezawafofegifade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6980d44-1b9d-46e9-adcb-dbad582fe435/guwakonijikatupuboxuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1098cca9-ce84-42b4-9513-c585e05966ce/linegegaveguwisoxotu.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/4519457421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6c83e7-d565-477b-8a36-9e7aeea21670/35999547605.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/30858597929.pdfIn PDF document text
    • http://fokibuzevurir.rf.gd/pikesesewasile.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 5672 bytes
SHA-256: 9dcfcacecdbe122edc7b9c04a47d86ff17b9cf8670c5f55280d771325e80c849
font_01_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 10732 bytes
SHA-256: 1471b169eb862649accc0bfc764e509c5b0b7be4a6451c7bdaf60603928f3c22

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