Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c100075ff83c79a…

MALICIOUS

PDF

80.3 KB Created: 2021-02-22 08:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e5403daea5821a91caaffaa6e388a494 SHA-1: 1c18bd98104698e0f5a038a1dfc82edb4874b311 SHA-256: 3c100075ff83c79ac894e4f392e28b69d1e04ce66bbe52d992a1ab1b7fa2e58f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. The primary URL, 'https://jottigo.ru/strik?utm_term=can+i+use+my+phone+as+a+remote+for+directv', suggests a phishing or scam attempt by mimicking a search result. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

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://jottigo.ru/strik?utm_term=can+i+use+my+phone+as+a+remote+for+directv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453335/normal_602d07f343c37.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/ghjgghe/civ_5_no_expansions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366627/normal_5fec773420266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462036/normal_5ff76b209e8bc.pdfIn PDF document text
    • http://heymama.store/teoria_del_entrenamiento_deportivo_pzirm1.pdfIn PDF document text
    • http://dektesheff.xyz/152197641758tvnm.pdfIn PDF document text
    • http://biggymstoe.com/jasuvesaw366w8.pdfIn PDF document text
    • http://harkateine.fun/852815210402bv24.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/hflXged/frases_tumblr_cortas_para_fotos_de_amor.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxozamikoge/Q5rhbSK/replika_pro_free_download_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_600a24ff2e393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_600cb6b563593.pdfIn PDF document text
    • http://vulgargirls.fun/bojoxodedekakknd84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462694/normal_600171ae529fb.pdfIn PDF document text
    • http://xajoraxi.22web.org/duct_smoke_detector_installation_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/GcijAha/2_kisilik_ates_ve_su_5_oyunu_oyna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekepozime.epizy.com/luigi_s_mansion_dark_moon_strategy_guide.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 5432 bytes
SHA-256: 190ea3faae601324b28bef3b2c627d3e9bbf6a831eb37c3f44cb8b28b19acd30
font_02_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 11032 bytes
SHA-256: 9b0ab9b051f87775bd96f430eac4c93d9738a41d1a08f28ca0b6c64c286a6580
font_03_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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