Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d184df03d5e56a…

MALICIOUS

PDF

77.9 KB Created: 2021-03-08 09:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 301a98c5ae15239443530a877756331d SHA-1: 420a15dd362039243aa1f672d74d9daed93240f9 SHA-256: 91d184df03d5e56a605c69b3995b9f282d1907bf1a2b7f1da18db0ac8e2ac6a2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution document. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to contain metadata related to its creation, but no direct instructions or lures are discernible.

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://pelibifir.ru/wix?keyword=laser+x+double+pack+manual PDF link annotation
    • http://expressday.online/estructura_de_un_texto_informativo_noticiahk6ia.pdfIn PDF document text
    • http://sendgrid-de.com/75485732407rqm6e.pdfIn PDF document text
    • https://kevibudoja.weebly.com/uploads/1/3/0/8/130814666/vofit.pdfIn PDF document text
    • https://gozawufi.weebly.com/uploads/1/3/1/3/131398332/8567099.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/3f15f4e3f9e.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/jfhdAhe/flexeril_classification_number.pdfIn PDF document text
    • http://lastmarkt.ru/xuvosukuxuxigesokel4h92.pdfIn PDF document text
    • http://firstreadersclub.com/174475331211uh4.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/need_for_speed_most_wanted_remastered_mod_pc5z5ap.pdfIn PDF document text
    • http://ital-girl.space/sindrome_de_ulises6i557.pdfIn PDF document text
    • https://pedexanagokol.weebly.com/uploads/1/3/4/6/134635549/d16f3b46.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/migemadibud.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/1haeSE0/glymphatic_system_brain_detox.pdfIn PDF document text
    • http://forkidsshop.online/turobaviwesales8u2t.pdfIn PDF document text
    • https://teniroge.weebly.com/uploads/1/3/4/6/134693228/4f119935c47df6.pdfIn PDF document text
    • http://specialsale.info/vukatewuwepefulekik8zdh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nudibiwer.epizy.com/33055582125.pdfIn PDF document text
    • http://lixazavifamu.rf.gd/what_does_the_oak_leaf_symbolize.pdfIn PDF document text
    • http://mozifateguvogab.epizy.com/47019987494.pdfIn PDF document text
    • http://gezogiz.epizy.com/36293702299.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_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 5432 bytes
SHA-256: c46fd43542c94deffb76fa67fd9126dd0b2cb60ed9f02f911b9318efb7d3eac9
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 10932 bytes
SHA-256: 18788efb3f9d712d09061e6a70ea34c3a8dd9dd4e32229170a21580d96177f70