Malicious PDF — malware analysis report

Static analysis result for SHA-256 107cfcbbb3cf8db1…

MALICIOUS

PDF

69.8 KB Created: 2021-02-19 02:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fe597bb9f9259e7843b4049735a20de1 SHA-1: 291fab4adc3e3854cc1216887941729493b6c350 SHA-256: 107cfcbbb3cf8db1822bb36f039b47550539a89d421bdeb60e21d40e6dbedbaa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords that appear to be lures for users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=kinfolk+unsung+heroes+pdf PDF link annotation
    • https://cdn.sqhk.co/betewulo/ibgfihY/96062507677.pdfIn PDF document text
    • http://duvevonisupobav.22web.org/digi_002_work_with_pro_tools_12.pdfIn PDF document text
    • http://izzzaaa.space/2000_dodge_caravan_service_repair_workshop_manual_download901xn.pdfIn PDF document text
    • http://bu-markett.com/bobilewagufudepodixeraxuxezls.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/Accgjjg/xefuwexaruno.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/a5ibTgg/dozutigasixinezaruzadega.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/Piiggha/73427328548.pdfIn PDF document text
    • http://instasurprise.online/95405661436fyovg.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/Hgghew4/doxesulaxofepeniwo.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/Inhajbe/fowolu.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/hd1bKjh/men_s_fireman_costume_xxl.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/fizup/70367500570.pdfIn PDF document text
    • http://melaworogafema.epizy.com/89104932829.pdfIn PDF document text
    • http://jetetekeputesi.epizy.com/burglar_alarm_sound_effect_free.pdfIn PDF document text
    • http://fopebuzab.epizy.com/pexoxasedosatimak.pdfIn PDF document text
    • http://fogalefudomuj.epizy.com/dejufonugiw.pdfIn PDF document text
    • http://verofibigo.epizy.com/38987081593.pdfIn PDF document text
    • http://bosewavim.rf.gd/are_skyworth_tv_any_good.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/64254491110.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 5124 bytes
SHA-256: a737a0fe40637bf5679128c174696db9dacb9a3569e06f70ca719db9502d8d94
font_01_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 10136 bytes
SHA-256: 182882e203aaaae74701d131355504345a3dbca9b100fa8b095aa94e59cb80e7

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