Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d10ae095dab73ed…

MALICIOUS

PDF

79.6 KB Created: 2021-03-07 01:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d9d971d91ba9c05e3c07280c9731faa SHA-1: 21763cb46a947b03035109eaf5c94812797dfcc2 SHA-256: 2d10ae095dab73edaebb1172b18761367dc58f1ee4c3d246fc5df42ea6de6a16
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least one pointing to a domain associated with phishing or malware distribution. The document body, though heavily obfuscated, appears to contain keywords related to technical topics, potentially used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+to+change+the+ground+drive+belt+on+a+craftsman+riding+mower PDF link annotation
    • http://creditscorecard.info/73024925364wmbc3.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/linksys_ac1200_range_extender_2_pack.pdfIn PDF document text
    • http://fogafiv.mypressonline.com/philippine_red_cross_first_aid_training_schedule_2019_laguna.pdfIn PDF document text
    • http://flymoney.net/xagexukikesoth5u7.pdfIn PDF document text
    • http://piguzipudoval.iblogger.org/102547752.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solepaf.epizy.com/78094297085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f1a5c6-f7ec-4c92-936f-4e513944a0d0/wefaruvezapivopiturej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b784d0-0cd8-4c5d-a619-c6b358865ac7/godepuzup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72410b65-ff94-47fa-947a-9890b238d185/how_much_does_a_crime_investigator_get_paid.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/finiwawepegerif.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/chiquititas_brasil_1997.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/80610943787.pdfIn PDF document text
    • http://gupiwapojukoba.epizy.com/teledyne_laars_pool_heater_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/annihilation_of_caste_by_ambedkar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77fdeba-1fee-43fc-b239-84743e72565a/ssr_125_pit_bike_for_sale_near_me.pdfIn PDF document text
    • http://setebuvoterir.rf.gd/92852955213.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/saxunulivitokoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/kicau_anis_merah_gacor.pdfIn PDF document text
    • http://bajokekez.epizy.com/xadixusapulelipakusawizap.pdfIn PDF document text
    • http://satanomoxa.rf.gd/3d_animation_maker_apk_free.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_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 5688 bytes
SHA-256: a602825428270decb1f16a4c7fdbccaced59012971dfca24c2509037ca02b5c6
font_01_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 11028 bytes
SHA-256: 1c1aadfbda41b162dd77255bd0e105ab26d1004d378208304deec67457365636

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