Malicious PDF — malware analysis report

Static analysis result for SHA-256 92da4995c3c5b98e…

MALICIOUS

PDF

74.2 KB Created: 2021-03-07 12:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d16369e51dc7c1bf8fd5706642e39dfb SHA-1: a9f16c4d531163b2af4dadc9ff9ce3a39e19c19c SHA-256: 92da4995c3c5b98ec674432323c7c82c63e8528fde06220fdb72cb05b569221d
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing/malware distribution attempt by ClamAV and ML classifiers. The document body, though heavily obfuscated, contains text related to 'dial request' and 'ussd request', suggesting a lure related to telecommunications or service requests. The presence of external URIs and the overall detection by security tools strongly indicate a malicious intent, likely to redirect the user to a compromised site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=dial+request+modified+to+ussd+request+verizon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403418/normal_600c061423f40.pdfIn PDF document text
    • https://bunikesetula.weebly.com/uploads/1/3/0/7/130739723/1767074.pdfIn PDF document text
    • http://wide-do.top/chapter_15_reading_guide_15-1_the_puzzle_of_lifes_diversity1x788.pdfIn PDF document text
    • http://detijiwajak.22web.org/resumen_corto_de_la_novela_lazarillo_de_tormes.pdfIn PDF document text
    • http://bt-management.website/accident_report_in_denver_co1ncso.pdfIn PDF document text
    • http://viewcreditscore.info/kayarian_ng_mga_salita_worksheet0u5up.pdfIn PDF document text
    • https://dasewukux.weebly.com/uploads/1/3/5/9/135956745/397de69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_600de95090fb3.pdfIn PDF document text
    • https://zuxogujuwikowe.weebly.com/uploads/1/3/0/9/130969390/jivotimulunofa-dirudivekat-xawaribob-fogubuduresar.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/5e5ca40b-5c8b-47b9-9161-a8a4779b9b3f/kofipoxogibure.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/maytag_oven_buttons_dont_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7cd604-8fbf-4fc0-a4eb-a486fd0cfde3/vizio_sound_bar_5.1_price.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/come_avere_vsco_x_gratis_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eceb2358-5f12-4506-80f3-67cea66016a0/how_to_use_garmin_marine_gps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f8b4a6-ef00-4afe-8d9d-53c914c204e1/time_warner_cable_remote_manual.pdfIn PDF document text
    • http://xuzujokavagud.epizy.com/fazer_video_facebook_privado.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/zanepavo.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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 5288 bytes
SHA-256: ed03a87e903d98d281e49d303a8f11324901bd1e94e61e71b9b4a5dbf349cdf5
font_01_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 11212 bytes
SHA-256: b4a8e70bb9af1b6e358830c0af36882215272bc90c6e17c2d2275b1c5c111753

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