Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3438a62c2945ba…

MALICIOUS

PDF

167.1 KB Created: 2021-03-16 12:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 82370c319d2f613a02e55cd7e43fff66 SHA-1: c8112885308a46b1570a31753d1924657ef7a22b SHA-256: 1d3438a62c2945baeb31c9f3644ea866938c7f0874a63292b681e11e80979dc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9945

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/123?utm_term=apowersoft+video+er+crack PDF link annotation
    • http://vedefufedogoke.iblogger.org/12_week_bodybuilding_mass_program.pdfIn PDF document text
    • http://milanbeach.fun/th10_war_base_2017v17m0.pdfIn PDF document text
    • http://ru-dev.xyz/york_diamond_80_btu_ratingxrhqs.pdfIn PDF document text
    • http://nely.xyz/nibipujukiliresiuvgkt.pdfIn PDF document text
    • http://zufonedisogaj.iblogger.org/traumatic_asphyxia.pdfIn PDF document text
    • http://muriwilosakud.iblogger.org/easy_crochet_patterns_for_bulky_yarn.pdfIn PDF document text
    • http://felidefewipikig.22web.org/16976601404.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/digital_signal_processing_salivahanan_free_downloadnt2gx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_d7c89ae29b9a402183afdc43a1df9134.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/tarogubuvubevatifo.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/crowdsourcing_platform_freelance.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_13c12bda8a284eedabc4d9f8005eb0c9.pdf?index=trueIn PDF document text
    • http://bewebumaxof.epizy.com/bamboo_wacom_app_for_android.pdfIn PDF document text
    • http://zozezad.epizy.com/76565219186.pdfIn PDF document text
    • http://wuparol.epizy.com/lasitokel.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/minecraft_pe_free_pc_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/ketorerulepeguti.pdfIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_5489149d4e0a42cd9ee446d01e90d009.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_6d40903410594b78b735b9982bdbcbd9.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_b51b749adf9c4dd6a3231b79d30e3e8c.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_a9190c07694f4140acc845fce4950a41.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_701238da2af041e39d96d537087e21c1.pdf?index=trueIn PDF document text
    • http://wigelasipop.rf.gd/ruwenumegisozef.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_14ef1e5187a44934842f82525aac6519.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_ff6a4474e7b347d8894254bded7060ba.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_b6be7283c2e8407b9d3aea1b34141c7f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f9e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF9E4 116776 bytes
SHA-256: 7470e2ff50c087ec38e1a529259cf5c463269978d4370d785ba14d349c4c1ecb
font_01_sfnt_off0002544f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2544F 5324 bytes
SHA-256: 9a731e86029d7b063d170975c8bfa047d94fc1f05e267023504ea1b3af290a48
font_02_sfnt_off00026693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26693 11108 bytes
SHA-256: 67284e6eab57b529f8c80efc2b208268f6f23884764301a9964a63e8b6824849