Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f377d98e1e11d4…

MALICIOUS

PDF

79.9 KB Created: 2021-02-28 00:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0835dfa42834826d14ba0b270153b3aa SHA-1: 5a8652c379f368f05bdb234f0f932bfd5b85926f SHA-256: 81f377d98e1e11d4e1a083e0eb8c55d98768f2b7499591cdef3f8e198460716b
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are designed to mimic search results for software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm heuristic further supports this assessment.

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://jacksth.ru/wix?keyword=pokemon+xy+emulator+for+android+apk+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5feb19735e9e4.pdfIn PDF document text
    • http://dkmz1.club/57826375434bmq9e.pdfIn PDF document text
    • http://nyvelsets.online/79972943633hi974.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/what_is_facebook_recovery_email.pdfIn PDF document text
    • http://qiwi-wallet.online/realspace_magellan_collection_l_shaped_desk_assembly_instructionsxlmtw.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/flysky_fs_i6_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_5fd1efc172643.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/gipisejud.pdfIn PDF document text
    • http://vovality.club/install_windows_xp_on_limbo_pc_emulad52mg.pdfIn PDF document text
    • http://sawalaxal.66ghz.com/11562468812.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5fcdd9b746610.pdfIn PDF document text
    • http://vengriya.space/gamesir_g6_android_setupjlh7b.pdfIn PDF document text
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/mavifimeso-kebifawuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suzerukudatede.epizy.com/what_was_the_original_theme_of_black_gospel_music.pdfIn PDF document text
    • http://sokevojufepizi.rf.gd/53140979931.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/vuwejozizanok.pdfIn PDF document text
    • http://vokulokunupada.epizy.com/41132585870.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_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 5336 bytes
SHA-256: 79b720a3ad9fc404e5d0d303598d790d113e771e8d9b25e046749e0919384a92
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 10128 bytes
SHA-256: 15ed600506448cf2e2f820b76d77880c4c8c0fbe918caffbeb0bf3fd6c325639

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