Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f727cbe7b2f702…

MALICIOUS

PDF

84.3 KB Created: 2021-05-15 23:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7df1ea3fc70ad9e6a62294ee9e27a392 SHA-1: 161c327c49433f727f7c5bf970a052a14676d43b SHA-256: 50f727cbe7b2f702d777b1b742bb16239de3adc167faf84b224d6654f421e4fb
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a phishing or SEO link farm document. It includes an external URI and an image lure linking to an SEO redirector, specifically `https://jottigo.ru/strik?utm_term=why+won%2527t+my+ue+boom+turn+on`. ClamAV also detected it as `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0`. The document body, though partially garbled, contains text related to the lure, suggesting a social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=why+won%2527t+my+ue+boom+turn+on PDF link annotation
    • http://vopibuxipem.22web.org/delhi_university_5th_semester_date_sheet.pdfIn PDF document text
    • http://bivebojulop.iblogger.org/atlas_copco_air_compressor_user_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/editing_a_friendly_letter_worksheet.pdfIn PDF document text
    • http://digotadegijo.epizy.com/25162191485.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_8daa897eb7b34686b0cbf16285327289.pdf?index=trueIn PDF document text
    • http://banobozibijur.epizy.com/70129198219.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/thomas_alleynes_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/gikazevidatogevuj.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/coliforms_present_in_well_water.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/7th_grade_math_problems_with_answers_worksheets.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_a17dec09121c42c2897c44cce36b69d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/lirawitox.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_3cca39e0325a4b6b901d32df76ad0c03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/14480066236.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_76a39539603e495b8bd88d06e7b33352.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/naxabijalavolinapodoba.pdfIn PDF document text
    • http://betiger.epizy.com/ikea_kitchen_cabinet_price_list.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/rogofemineberoxig.pdfIn PDF document text
    • http://roxugotosaka.epizy.com/8229374149.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/big_boss_pressure_cooker_reviews.pdfIn PDF document text
    • http://geladafifalisak.epizy.com/nosutugiti.pdfIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_c5d3dbcd5d864583bbaf489ef59c4f49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/william_baum_compreender_o_behaviorismo.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/dejuju.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/what_episode_does_elena_and_damon_have_their_second_kiss.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/godojazepoginubuwu.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_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 4884 bytes
SHA-256: 8285049ef73aa72bd6a710d371b7bacd8fcca9942b14823e948210be08583ef5
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 10896 bytes
SHA-256: c21ed9f5dd2ceba45efcc8f5eb83301a1ef9c52ce5c1fb0ec13f18a7bc14ec63
font_02_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 16292 bytes
SHA-256: 78b2f08628a3d196c252bd52f69b70ef54324ea9e3cd51effc42269334029ccf