Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a9dfb86651024b…

MALICIOUS

PDF

89.3 KB Created: 2021-03-18 13:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 35a94e81dc24fd00d1d35b29a9eebe4a SHA-1: 4e5fbc3740ead5f44ab3776fdc13b844172e34df SHA-256: 05a9dfb86651024ba4673d5504f75c4eb328bdc5d6a6136841eadfd4ac7e42f9
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://dugedepap.ru/wix?keyword=cyanogenmod+installer+apkpure PDF link annotation
    • http://juzajikadig.22web.org/19489637634.pdfIn PDF document text
    • http://papopeputato.iblogger.org/11745367123.pdfIn PDF document text
    • http://peskomment.ru/85161739890zh0j3.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/93208688453.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/gejomozasosute.pdfIn PDF document text
    • http://jebotegivul.22web.org/30_qualities_of_an_entrepreneur.pdfIn PDF document text
    • http://bitsracing.net/corrugated_plastic_roofing_sheets_nottinghamwmf81.pdfIn PDF document text
    • http://alex-chekalev.com/caillou_theme_song_violin_sheet_musico79hg.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/bizojesuzuxufakezale.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/6399753.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/govonefanutigo-xuzisovunivov-puribawugu-pojijojozat.pdfIn PDF document text
    • http://mantenancie.com/jovonowirurimcsc90.pdfIn PDF document text
    • http://mojamozegibobav.22web.org/developing_critical_and_creative_thinking_skills.pdfIn PDF document text
    • http://yewes.fun/95515780508h41kl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://pazatirademe.rf.gd/sukilo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/cdc_gonorrhea_fact_sheet.pdfIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_bcef6a905ee34a38944ee9fcad79ed99.pdf?index=trueIn PDF document text
    • http://fipulosabonug.epizy.com/huduma_number_registration_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/how_to_apply_psychoanalytic_theory_to_literature.pdfIn PDF document text
    • http://bolutiso.epizy.com/raribupolupazavebojukiz.pdfIn PDF document text
    • http://metepukiwameme.epizy.com/rainbow_vacuum_repair_winston_salem_nc.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_79be2ec20a714c8489464bfe47293cb3.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 5348 bytes
SHA-256: 42f0f00f2b7e4d605fae87d22bdcb6a90b79b280b451d5029451ba67054b7a76
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 7972 bytes
SHA-256: 78c59dcd17fdbfaf74b4d352bcad9a0f96dcd6fa30fa9c0035bf672f653d287b
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 3052 bytes
SHA-256: fc381b39543a08e81119775cccf639419faba5d95db66f359d8b7b13cb0ff3ed
font_03_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 11040 bytes
SHA-256: 8beb142ed588cae8db5ccbab48c1d702e7ac37a217253fa27c56553a0b84516c
font_04_sfnt_off00014098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14098 16372 bytes
SHA-256: 132ae43d955de9dfa2b3116d95d01e2bccb97f2fd48abe696f4b43e18e96acbf