Malicious PDF — malware analysis report

Static analysis result for SHA-256 551fa0db17d579d1…

MALICIOUS

PDF

88.1 KB Created: 2021-03-21 05:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3d6809356f4bc21468b7965df0fa379f SHA-1: c44e290a935484d9d90f643c909d0b8ddac1b39f SHA-256: 551fa0db17d579d1e97f1973e134d2f4e673fcbe862c609a8ced2b0b362f2198
192 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a link farm hosted on disposable domains. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent to redirect users to harmful content. The document body, though heavily obfuscated, contains text related to 'Animals pictures and sounds' which may serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/123?utm_term=animals+pictures+and+sounds In PDF document text
    • http://polnews.xyz/what_type_of_intermolecular_forces_does_ch3f_havetlhbt.pdfIn PDF document text
    • http://maretexojud.66ghz.com/26943798121.pdfIn PDF document text
    • http://najefot.22web.org/template_of_personal_statement_for_cv.pdfIn PDF document text
    • http://tiwirodizefa.iblogger.org/cao_beveiliging_2019.pdfIn PDF document text
    • https://fadirepux.weebly.com/uploads/1/3/1/4/131438814/gifeninarufodi_xenab.pdfIn PDF document text
    • http://oneitstore.info/6684275927626xza.pdfIn PDF document text
    • http://lozaratoz.iblogger.org/being_and_nothingness_free.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/75513.pdfIn PDF document text
    • http://pagebake.com/differentiate_formal_and_informal_definition_of_words_brainlyndxe4.pdfIn PDF document text
    • https://movojedafep.weebly.com/uploads/1/3/0/8/130814843/namamekida_jusabizatof.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/9b123728d.pdfIn PDF document text
    • https://basexexax.weebly.com/uploads/1/3/4/3/134308464/5092277.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talakukatutevib.epizy.com/48459011689.pdfIn PDF document text
    • http://ximawefab.epizy.com/tujarefexotixefurejenaj.pdfIn PDF document text
    • http://garapaf.epizy.com/epson_adjustment_program_l3110.pdfIn PDF document text
    • http://tapegazopiguw.rf.gd/the_americans_mcdougal_littell.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/99204518221.pdfIn PDF document text
    • http://ginisanekuxowo.epizy.com/tadufu.pdfIn PDF document text
    • http://deseduwuwis.epizy.com/gotalewakojilimibekis.pdfIn PDF document text
    • http://zinebozozapi.rf.gd/sodujemimi.pdfIn PDF document text
    • http://relavidapozo.epizy.com/sap_business_one_free_download_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/pobuvivijamise.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/how_many_employees_have_you_directly_supervised.pdfIn PDF document text
    • http://jusaxokipumata.rf.gd/vuzozazejenu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 5208 bytes
SHA-256: 19196068c844ddc43c1e9dc17746994b1f8148607dbb89538b563242ff5163f3
font_01_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 4304 bytes
SHA-256: 8a3072d4bad45173aa433eca15014532467858270ef5a1624fe91a5dff7ae4c7
font_02_sfnt_off00012c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7E 11308 bytes
SHA-256: 8f2c5461a4453adef04fe2f0556d66d5000972945b4d66c704bbb1b7c8559c0d