Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c510a258f970932…

MALICIOUS

PDF

84.9 KB Created: 2021-02-27 22:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a3e226eef512b793a5dc28dd23949939 SHA-1: 7d774fda7bf3317b1f414a47270da8a3b8d24290 SHA-256: 5c510a258f970932f70a7b4740035ca0ff1dd9381d5fb6dc09a0d852df62b5cc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and employing UTM parameters, indicative of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection as 'Pdf.Phishing.Trojan' confirm a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=what+does+service+manager+do PDF link annotation
    • http://prizinsta365.website/domestic_animals_worksheetsst07y.pdfIn PDF document text
    • http://youla-24.cc/pasofiwodaleponesuposug58eh2.pdfIn PDF document text
    • http://setofexperience.site/vamumonnyoxy.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/e738d520896570b.pdfIn PDF document text
    • http://kokilubowo.22web.org/mannargudi_weather_report.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/6bd43c41.pdfIn PDF document text
    • http://libralab.digital/ames_performance_center_burnsville_mnmiuq9.pdfIn PDF document text
    • http://alex-chekalev.com/sivirao0f8c.pdfIn PDF document text
    • https://paseruvuweduzuw.weebly.com/uploads/1/3/1/4/131437476/8534705.pdfIn PDF document text
    • http://winoorama.space/can_i_connect_apple_airpods_with_androidjdv3r.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/why_is_my_toshiba_tv_not_working7644p.pdfIn PDF document text
    • http://prolac.ru/79680701837anwmn.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/tusop.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/80s_movie_quotes_trivia_questions_and_answerswgg5k.pdfIn PDF document text
    • http://rezltml.xyz/friction_and_gravity_worksheet_a8gwph.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/f5f0ad7738069b.pdfIn PDF document text
    • https://wegedojilo.weebly.com/uploads/1/3/1/3/131398291/kuvawisuxevik.pdfIn PDF document text
    • http://samo-katim.ru/15962020078gif2h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewivifonawati.epizy.com/who_in_mary_poppins_returns_was_in_the_original.pdfIn PDF document text
    • http://wojodiguf.rf.gd/dunkin_donuts_hot_coffee_sizes_ounces.pdfIn PDF document text
    • http://wujawejibizub.epizy.com/closed_syllable_exceptions_worksheets.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_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 5392 bytes
SHA-256: d2908f6860679cb9f11661db65a4484b6466387ba8b79a4406d4a14ffa2951b5
font_01_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 10672 bytes
SHA-256: 1fd506035d7813668b06ad1ef47ac2ac5bbcb2f6517fafd8b8626ed743c5a483
font_02_sfnt_off00013112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13112 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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