Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a54e44fd17f9846…

MALICIOUS

PDF

82.6 KB Created: 2021-03-11 04:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c8c253b53072e4aa664a9f44908f206b SHA-1: 384c63db73ed32541d70ef25a062b13d862c5944 SHA-256: 2a54e44fd17f9846392debfe25ffe61154d5be5e1cfcf6f67c38b76bc93220eb
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure for potentially malicious downloads.

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/strik?utm_term=mag+one+bpr40+programming+software+download PDF link annotation
    • http://dujojiwasemob.mywebcommunity.org/brother_hl-2170w_wireless_setup_download.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/67512adddbdc.pdfIn PDF document text
    • https://wofugegiperezaj.weebly.com/uploads/1/3/4/5/134528457/bafupaf.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/rumul.pdfIn PDF document text
    • https://gavufiwi.weebly.com/uploads/1/3/0/7/130775220/lopinokadine-pomen-fizik-zegadage.pdfIn PDF document text
    • http://biduwupukipajov.22web.org/97153607087.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/can_garageband_export_midi_files.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/wahl_lithium_ion_duo_premium_hair_clipper_and_trimmer_kit_reviews.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/619470.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/48a4239e-ad8c-40af-8414-eee5737bb95e/youtube_poker_cash_game_2020.pdfIn PDF document text
    • http://wifikip.rf.gd/past_participle_adjective.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/waxajevatafegibuf.pdfIn PDF document text
    • http://mokupemoraworal.epizy.com/fovizafapesozezijimu.pdfIn PDF document text
    • http://fofiwufawiparug.epizy.com/4918439112.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/mozilla_old_version_free.pdfIn PDF document text
    • http://womawujun.atwebpages.com/difference_between_hero_4_silver_and_black.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/poemas_de_lengua_indigena_cortos_con_traduccion_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ad4b22-7099-404f-b7f4-4db861655cb0/35090896885.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_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 5828 bytes
SHA-256: 2f1a4888964369b726d672efc10d4fb756c7c16f73fac8af16e561d8234ea179
font_01_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 11040 bytes
SHA-256: 32c95ea6824007adc48cb62ba1d94fd3acc986ac22f1340d8ac83782fe6cc707

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