Malicious PDF — malware analysis report

Static analysis result for SHA-256 637faa518fae78f8…

MALICIOUS

PDF

93.7 KB Created: 2021-03-07 17:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ba134cc3164eb3064047239ef3e65bfe SHA-1: 51577800ef11267d49dd2a35a73bb1e1ad16f69f SHA-256: 637faa518fae78f8dc9173b0a9b7b03aeb350785e88ec5badfbbb3bd4973f370
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a downloader or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM firing further supports this, indicating the PDF is part of a link farm hosted on disposable domains.

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://jacksth.ru/wix?keyword=goodbye+catch+me+if+you+can+pdf PDF link annotation
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/50eb8177552.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/2950546889.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/javixegokusijenivisezo.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/1990_jeep_cherokee_transmission_replacement_cost.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/line_6_spider_iv_30w_1x12_modeling_amp.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/tefolujalulinatidod.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/iipN6jg/pokemon_cards_target.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/why_did_the_northern_renaissance_take_place_nearly_100_years_after_the_renaissance_in_italy.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/la_mscara_de_la_muerte_roja_de_edgar_allan_poe.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/51036355109.pdfIn PDF document text
    • https://cdn.sqhk.co/tudenireso/tGjagi4/tizuveximagifugijad.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/dajavaz.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/kunudoz.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/how_to_use_maschine_mk3_as_midi_controller.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/7cce5c9d32d869.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/notofumifef_livevosumiv_bavisudad.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/90366864-fdd7-410a-9de9-2b7f56d79a2b/lojiniwigejojefup.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/paguvepexogevapuwep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa21f0f4-ac2f-4e2c-bee0-2903564a6420/golds_gym_platinum_home_gym.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_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 8064 bytes
SHA-256: e70aa244d02eb34421dc9b209dbe5b5a66a86e924c5b2572d36dc3a263635c03
font_01_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 5360 bytes
SHA-256: cc834b758a0bc07cfaf8ba4ec8593b7ae2390c3f27ccbda2a1a6c6bb42df9cac
font_02_sfnt_off000145d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D9 10404 bytes
SHA-256: e336cf08f163a5c0b0e9a54968beeee042f9d7786db1b79cf56a0166f4edb343

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