Malicious PDF — malware analysis report

Static analysis result for SHA-256 770e4248a86470a7…

MALICIOUS

PDF

77.5 KB Created: 2021-03-31 08:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb06cf5ec5cab404ec26b122a80be6f5 SHA-1: c4ba594baaa96580d7d38922351036ae52dcef04 SHA-256: 770e4248a86470a7829f0098156eb22d3df2abd04655d47b049368be75881451
156 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 0.9996

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 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.
  • 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/award?keyword=integral+calculus+sample+problems+with+solutions+pdf PDF link annotation
    • http://chambreapp.xyz/jeraxibvln3p.pdfIn PDF document text
    • https://vimasideb.weebly.com/uploads/1/3/3/9/133997972/vetetelupovap.pdfIn PDF document text
    • http://sfhgfje5df.xyz/84328240810zdhkv.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/7a4917d248abd.pdfIn PDF document text
    • https://jawufilarom.weebly.com/uploads/1/3/6/0/136054640/6701402.pdfIn PDF document text
    • http://domainlimax.xyz/are_all_dads_entitled_to_paternity_leave8vy2p.pdfIn PDF document text
    • https://wovegusokab.weebly.com/uploads/1/3/4/8/134850220/1532245.pdfIn PDF document text
    • https://fozumazajafipal.weebly.com/uploads/1/3/4/5/134588547/0e8ef32e3d.pdfIn PDF document text
    • https://lakadepoti.weebly.com/uploads/1/3/5/3/135301691/2016877.pdfIn PDF document text
    • https://fazodokivev.weebly.com/uploads/1/3/4/0/134018208/mevorav_nimil.pdfIn PDF document text
    • http://ridunculus.com/excel_formula_multiply_multiple_cellssacwj.pdfIn PDF document text
    • http://pitushok.space/how_to_find_probability_percentagee953t.pdfIn PDF document text
    • https://demenuxukuxit.weebly.com/uploads/1/3/1/4/131438289/8203391.pdfIn PDF document text
    • https://rebomavarel.weebly.com/uploads/1/3/4/8/134883959/3977418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muxegeza/287912201.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/powerpoint_templates_math_theme_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/cootie_catcher_game_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/resobigovap.pdfIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_e5ec0dc0d77643a28f562cb675d2085b.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_efc716469f8c4ecf95dcfbe1c07cc1d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadere/is_alcoholism_considered_a_disability_under_the_ada.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 5620 bytes
SHA-256: a9d186fec226b83fa7422ec808b4a33b5a93c8214364675498173b609812991d
font_01_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 10796 bytes
SHA-256: 419960f14a18a6d3b385f58f94a641403786aa0058f84efe718248debbffd771
font_02_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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