Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d56035b316bba49…

MALICIOUS

PDF

75.2 KB Created: 2021-03-17 21:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 255bfe57ba87c1c6cdb6e4a112820f1b SHA-1: a90ef7177cdb74e493e0a35efbeb9cc6cda290d3 SHA-256: 1d56035b316bba495459cf36c9e4c1f72c92e6144602f16e0550e1839e776288
134 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic firings indicating it is a link farm and a potential phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a phishing attack, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://golowaki.ru/award?keyword=factores+psicosociales+pdf PDF link annotation
    • http://bekopomulasebi.getenjoyment.net/the_bible_timeline_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_5fd7b35757c0b.pdfIn PDF document text
    • http://flowerport.shop/pcf_to_kn_m3_calculator98ztw.pdfIn PDF document text
    • http://mirror-x.org/supiziwafudixirakopa3vfqh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_5fe3efc99269b.pdfIn PDF document text
    • http://poopo.ru/42731713811dxakm.pdfIn PDF document text
    • http://olymp-trade.top/what_is_regurgitation_gerdfjbha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477623/normal_603960aee53a6.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/saeco_espresso_machines_costco.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/68469348502.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/zekizidexadolixe.pdfIn PDF document text
    • http://wosutopanoba.mygamesonline.org/anti_dumping_agreement_wto.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/30531998783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_602a4f521b2cd.pdfIn PDF document text
    • http://alania365.ru/ios_10_beta_profile_linkvmbwz.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/685064a1-49f5-4407-a650-d7a71d098aa5/simple_compound_and_complex_sentences_worksheet_for_grade_5.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_be336898bba44538b4746a3926761ffa.pdf?index=trueIn PDF document text
    • http://gosaduzunake.myartsonline.com/13763687467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9553d681-4753-4257-8ee4-66754431e7a5/motorola_ms350r_35-mile_talkabout_waterproof_2-way_radio_pair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba48d97-220d-455b-b487-7fbdfd7b6028/magic_bullet_walmart_7_piece_set.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/boy_scouts_store_dallas.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_cd68af9bf5ac4f3b8907e25fa09ac506.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c792d4bf-a86e-4503-a81b-f17d925c6211/14194054754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14149ee-d5b7-4859-95cb-09c9510000bb/lenovo_t430s_memory_upgrade.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_3e0f83cd29284ae99c7c7998ef75d85a.pdf?index=trueIn 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_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 5104 bytes
SHA-256: 4757a0211fa4bbb4c76b9f7f841ad6d5ff1c6d58bc84c50518785ab047e04f6f
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 11008 bytes
SHA-256: fd22ebdf0736ed0cf0a78219965f8b30210275f8632a05a72f1542da6c4a1ccc