Malicious PDF — malware analysis report

Static analysis result for SHA-256 d900c0258950bc08…

MALICIOUS

PDF

77.3 KB Created: 2021-02-13 11:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aa324d86b52d5e276722dbbc2a50c84f SHA-1: eb471947f7f3979666b53f07d2e6b7415dd8af47 SHA-256: d900c0258950bc08ecb1d5b248bb32f9756ccee4e706ae553bcc7c17cce1eaec
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 is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'atoms and bonding ionic bonds worksheet answers', which is used to direct users to external sites like jottigo.ru.

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/aws?utm_term=atoms+and+bonding+ionic+bonds+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/gijesali/hjghsAl/kotovafutikufawifeju.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/ibZX0Zn/25556873366.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fefbfc048a2e.pdfIn PDF document text
    • http://dejasis.iblogger.org/69631291856.pdfIn PDF document text
    • http://allrecipes.pro/foot_adrenalyn_xl_2020_21_bookn6onj.pdfIn PDF document text
    • http://titanof-filtr.ru/xiwaneronofevebazp4szk.pdfIn PDF document text
    • http://rabejagoruwobol.66ghz.com/innocent_witness_free.pdfIn PDF document text
    • http://copyrighthelpptteam.com/ottoman_wars_listcd3ew.pdfIn PDF document text
    • http://grenkasalo4.xyz/character_letter_template_word4y50c.pdfIn PDF document text
    • http://zomesotemaxage.66ghz.com/the_battle_cats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472775/normal_5ff249d4b0ac5.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/o2bjigd/4_pics_1_word_level_2291.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/rkgicja/e_pluribus_unum_coin_value_2000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suxikikafib.epizy.com/boy_brigade_prayer.pdfIn PDF document text
    • http://gemakeruw.epizy.com/pisutejivegirijoju.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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 5604 bytes
SHA-256: 11fb689a4d8dcdaaec39d6db3c6743b80a5daf1a8f45d896a3d9240ca9e3af65
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 10772 bytes
SHA-256: 7483932e8fa347c447f7215f3567488d8b05a0ef0f8ccd9196e947f6b210babc

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