Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0545b9510b8974…

MALICIOUS

PDF

83.4 KB Created: 2021-03-16 05:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 34a8c38de638ffb9a71794252c138f60 SHA-1: e953b775c2e5eaee3e9a5260459ec9641d551df9 SHA-256: ad0545b9510b89742db55683e9a42a58efabb27209dc53ed22e7aec352c28226
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to dafemum.ru and a large link farm hosted on disposable infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to direct users to potentially harmful content, possibly for phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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.
  • 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=command+and+conquer+tiberian+sun In PDF document text
    • http://siankaanmexico.com/misijipudenozegutupati2bvci.pdfIn PDF document text
    • http://saudiautoinsurance.com/5th_grade_reading_comprehension_worksheets_multiple_choice_free8f5go.pdfIn PDF document text
    • http://ru-payment.casa/41470950579mjhzc.pdfIn PDF document text
    • http://groshyk.site/mujamyyrdb.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/9Qjcja5/kofupekomokudelaxipanem.pdfIn PDF document text
    • https://cdn.sqhk.co/xedaberetaj/ibiggdS/iie_open_doors_report.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/gLgfNbf/kuvexasomupawekubuf.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/53jbahc/pancake_recipe_gluten_free_rice_flour.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/ciiLhfh/euro_truck_simulator_2_radios_argentinas.pdfIn PDF document text
    • https://cdn.sqhk.co/fezozepefik/99DNUBj/45282056322.pdfIn PDF document text
    • http://merovew.xyz/black_friday_tv_deals_uk_43_inchixq4a.pdfIn PDF document text
    • http://reznitskygallery.com/kirchhoff_s_law_experimentrvomp.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/dw9gic4/xexapagu.pdfIn PDF document text
    • http://drovazvenigorod.ru/ms_word_templates49wwd.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinabom/60491182907.pdfIn PDF document text
    • https://bc80c028-b71a-4936-8b52-739d97125464.filesusr.com/ugd/fb4f66_efc788dc7c7e4d6fbd19cdf829ee8d1e.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_7e0a0473e2fe44eaa4219c3d75eec3c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/dazerimoxu.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_a082e1100bf845aea7c12f7aca5145bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/good_schools_guide_australia.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_2457a0fa0f4747eabb96fe4449c0fc1b.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_aebec01aa93e456681bf79991e650a8a.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f032.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF032 16200 bytes
SHA-256: 251e026946ff96458fcb533bb6cb0755bd4edc1a7f94ab4eb24a4be307954a46
font_00_sfnt_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 5224 bytes
SHA-256: d1675ae764d4432b8f4b14164fb87b75bc181185d28673fdd956d48d8d0e5a7c
font_02_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 10052 bytes
SHA-256: d3a04ba667834343b46a87fd98dd908e555cac19300f8b7db2bff44e7b9e69ca

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