Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c8071f4e1215a0…

MALICIOUS

PDF

76.7 KB Created: 2021-02-14 00:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3c5032ec910d743fec93857898b5b71a SHA-1: 7456af5059e49d625996f59c36804c38f67a90d5 SHA-256: 30c8071f4e1215a01936edb85b487ee189f6754fcf09c793c44f8397072891f0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', indicating a potential attempt to manipulate search engine results or redirect users to malicious content. The presence of multiple disposable hosting links and a UTM term redirector further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=ryou+bakura+dsod PDF link annotation
    • https://cdn.sqhk.co/figegixo/gdid4hc/run_sheeda_run_hack_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/djePjja/connect_dots_puzzle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/ghrOAhg/gunshot_sound_effects_library.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/heBVVOK/34392576787.pdfIn PDF document text
    • https://vujemojijub.weebly.com/uploads/1/3/3/9/133997462/dinavabasase.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/hCb31jc/29795723824.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/ym5qhje/duzoxigirupe.pdfIn PDF document text
    • http://vanlit.ru/arifureta_light_novel_volume_7ts632.pdfIn PDF document text
    • http://jowakemanek.iblogger.org/solo_vpn_apk_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/ipavWfV/65371695702.pdfIn PDF document text
    • http://cheatyou.site/tasuvagugixaziril7iikc.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/3waj6ci/cube_surfer_hacks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://niwuzij.rf.gd/muvowabetulapimubane.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/naralijefiro.pdfIn PDF document text
    • http://dejudunobagozut.epizy.com/lajakizitipemosaziv.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/bukur.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/distancia_de_reforma_chiapas_a_villahermosa_tabasco.pdfIn PDF document text
    • http://kerojuluped.epizy.com/vobujurusi.pdfIn PDF document text
    • http://zilokujidetomo.epizy.com/whirlpool_top_loader_washing_machine_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 3232 bytes
SHA-256: 2df2bad70f0a61b8e83cbdc68f9f753e94e063426a0e15966dec5afac024aeb9
font_01_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 4632 bytes
SHA-256: f6febaeedb5a6316b8b6743c89972664561c661d646380f75a3de011ee5bf911
font_02_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 11664 bytes
SHA-256: d1b947b40d50e33d79d4879bb9023105caf6c9358d98266c08b37b9b3081e513
font_03_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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