Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a54b735a126cccb…

MALICIOUS

PDF

147.9 KB Created: 2021-03-16 22:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0124767d93f180cdc935d6210d3e50ff SHA-1: b70139f02cc7d1f41864e76e877814a97f0587d9 SHA-256: 0a54b735a126cccb19c5d6c2a8b569cae5dc44de3dd54dac1fe33ac974d56b80
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that appears to be a lure.

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 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=love+in+the+time+of+cholera+literary+analysis PDF link annotation
    • http://fb-pageunderreview.com/facebook_ads_copy_templatexzr1e.pdfIn PDF document text
    • http://digitalmedialit.com/gojokejovunefozisi36ue9.pdfIn PDF document text
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/deremepadujatug.pdfIn PDF document text
    • http://site-shop.xyz/what_questions_do_you_get_asked_at_a_high_school_interview6csfy.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/make_your_own_python_text_adventure_a_guide_to_learning_programming.pdfIn PDF document text
    • http://ogranicbio.fun/85934199621acpyr.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/76232261082.pdfIn PDF document text
    • http://idealica-italiaoficial.site/aocs_official_method_ca_5a-_40u6swm.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/tasademafepa.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/ladowasefilubesoxasewb6s3.pdfIn PDF document text
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/2c36ee.pdfIn PDF document text
    • http://gerisekazaleg.22web.org/battleship_the_video_game_pc_free.pdfIn PDF document text
    • http://shoop-fg.ru/how_to_adjust_humidity_on_airsense_104p4fn.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/93799810246.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/6d41f2e0-46ee-48dc-a848-5594f0d6e48c/85245403536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f32d25-cba6-43f6-9105-ddefacdace6a/norcold_n611_recall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1d1f72-da8f-4af6-8560-10162e9e940b/shattered_sky_shader_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc9f987-f582-4249-833b-179c149653e9/how_long_will_non_filers_have_to_wait_for_stimulus_check.pdfIn PDF document text
    • http://vilobeve.rf.gd/jawbone_big_jambox_batterie.pdfIn PDF document text
    • http://desozubavoj.epizy.com/pharmaceutical_capsules_fridrun_podczeck.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F277 5224 bytes
SHA-256: 044b292c2669dc221ada580ee192faaf1cd32d46bc2ee973d3072b01e2cec979
font_01_sfnt_off00020422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20422 11592 bytes
SHA-256: 0494a2efc87b9ec0daf1b8deac1a940c26f41bc3ac46a4c1f20a24a24f45101f
font_02_sfnt_off00022ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AB4 16116 bytes
SHA-256: 66cd902b334fc3a8a450b3b7a42ffe5031cba7a4412f01eb774febfebf38087b