Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ea8e77373b9b5c…

MALICIOUS

PDF

141.7 KB Created: 2021-03-25 14:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4203a461dd7c26fdb5c06822b79c6829 SHA-1: 52dc1ee93539db5d8bebc4c4dd815745c94abd92 SHA-256: a3ea8e77373b9b5c9a34d1f09f43832740589471ebce284147cef5e0360581b1
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/strik?utm_term=grunch+of+giants+wikipedia PDF link annotation
    • https://pexagizim.weebly.com/uploads/1/3/0/9/130969673/pewijusevakanusijutu.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/pisipovurifemavog.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/69885329562.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/5024710.pdfIn PDF document text
    • https://vebuleme.weebly.com/uploads/1/3/4/3/134321641/3802477.pdfIn PDF document text
    • https://jexisaguratoka.weebly.com/uploads/1/3/1/4/131409442/eae5c90c59.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/ciehiXv/volleyball_vertical_jump_training_program.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/livro_castellan.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/xhgVhaB/ganimexazuwogijojopi.pdfIn PDF document text
    • http://mupifojoxur.medianewsonline.com/lullaby_of_birdland_big_band.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/hbeWihw/king_of_avalon_cheats_codes.pdfIn PDF document text
    • http://bunutib.mywebcommunity.org/modal_verbs_exercises_pre_intermediate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_788186208591424ca80a7de8435f20a7.pdf?index=trueIn PDF document text
    • http://jikirukuda.rf.gd/geralds_game_moonlight_man_explained.pdfIn PDF document text
    • http://xelidamos.epizy.com/itv_guide_rugby.pdfIn PDF document text
    • http://rixatupafavumub.epizy.com/harry_potter_book_4_illustrated_by_jim_kay.pdfIn PDF document text
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_85929d7370b84a74ad1ea7ae001ec691.pdf?index=trueIn PDF document text
    • http://tizafuj.epizy.com/mapelapipexowazidegamavov.pdfIn PDF document text
    • http://dosegetutep.rf.gd/angle_relationships_in_triangles_worksheet.pdfIn PDF document text
    • http://kikodufe.rf.gd/marathi_grammar_book_free_download.pdfIn PDF document text
    • http://nemabevuvuxale.rf.gd/bezelutuzakomomul.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_off0001e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E96B 5572 bytes
SHA-256: fe6027fafd5bc449333b3e66662d4b4cb3267355744afe91c0789e41a0b0711b
font_01_sfnt_off0001fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC76 13912 bytes
SHA-256: 7d8c8bc01169b7b8ee2e65c1f59fc0c0f6e67abdd26f7b9c854d34afacc96b91