Malicious PDF — malware analysis report

Static analysis result for SHA-256 490cd721f85d4d1f…

MALICIOUS

PDF

85.8 KB Created: 2021-03-31 20:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4550afb7067d61ee7da172303cc99a89 SHA-1: c573ae57f11a6e9fef330f86460db697f6c33876 SHA-256: 490cd721f85d4d1f31e9927148c1d67d23539fe4df4d3c40ff40b35323edd436
186 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. 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 0.9992

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 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.
  • 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://ponafet.ru/award?keyword=cours+anatomie+du+coeur+pdf PDF link annotation
    • https://cdn.sqhk.co/xuzuvazol/jexicML/head_basketball_cheat_apk_download.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/7566223.pdfIn PDF document text
    • http://comp-arenda.site/clinical_bottom_line_physical_therapyz5tpo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370088/normal_5fed775e8c2a0.pdfIn PDF document text
    • http://krym.today/the_essential_new_york_times_cookbookpdipr.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/gpIgilL/56938870660.pdfIn PDF document text
    • https://gabozagabu.weebly.com/uploads/1/3/4/5/134506959/8259477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5fe183089502e.pdfIn PDF document text
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/dojokevozibevased.pdfIn PDF document text
    • https://fukokegoxa.weebly.com/uploads/1/3/4/4/134463136/dowedobimatilu-xapoja-vibinorob-tudemozimo.pdfIn PDF document text
    • http://consequences.space/reverse_pec_deck_fly_machineohih1.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/1gguvQI/85644603141.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/xemelidutetimot-gijujezofajojax.pdfIn PDF document text
    • http://topcreditmonitoring.info/how_do_you_get_out_of_jail_in_monopoly_gamer6n1l6.pdfIn PDF document text
    • http://axecheat5.xyz/blades_in_the_dark_v8o1744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_e2e3132d9a4e48be8fdb9a480e202141.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/google_sheets_sumif_with_multiple_criteria.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/bootstrap_responsive_design_templates_free.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_eb2c85fe4d084fce9bc53db4ce33c040.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_549b709a60494ce58c610d576b073d74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupojakami/zaxazigikonegupetuponu.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_c2cb34cb5088406f99a3ffb29d03d718.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/backtrack_5_ubuntu.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_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 5172 bytes
SHA-256: 3a4aca0ed96ec9b7d3617cb9687ff1543dda1000ff44ee25f4d8ecaa88a5742f
font_01_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 12912 bytes
SHA-256: b910d6fdfe46a6289b5cabc1546e6667de385310c27e403e6e88d5143ba4ee15