Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac528d0dc501023b…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 04:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3cd6d0bf56c3baf0728b41519d85688 SHA-1: 9b5f5a35744fd2c23718ab66ec1e519568193d1a SHA-256: ac528d0dc501023b450f305d5c063eaf54f2180fb0c6da46648bd77e5c02a809
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Phishing.Trojan. The presence of numerous external links, including one pointing to 'nipisod.ru', suggests a phishing or content-farming scheme. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=scrum+a+pocket+guide
    • https://cdn.sqhk.co/xavaxonad/Ngjkhcz/beyblade_burst_turbo_printable_coloring_pages.pdf
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/nedukomakuvurafat.pdf
    • https://cdn.sqhk.co/pofaxexaxi/gdifKZs/shoot_the_duck_game.pdf
    • https://jopixumux.weebly.com/uploads/1/3/4/7/134734794/bewojepum_vegugudala_xitebiso_tofakokar.pdf
    • https://cdn.sqhk.co/bemememu/ggmawOO/37746522480.pdf
    • https://cdn.sqhk.co/gisepavuv/JCienjg/75117174895.pdf
    • https://cdn.sqhk.co/gusisitixinu/3Xi6hih/wheels_on_the_bus_lyrics_in_english.pdf
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/1653723.pdf
    • https://cdn.sqhk.co/nawamuzimosu/1hjhbmw/nimexe.pdf
    • https://cdn.sqhk.co/vitimosugu/gxgchcR/iphone_11_pro_max_has_120hz.pdf
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/3465957.pdf
    • http://lamenomapod.iblogger.org/environmental_impact_assessment_design_wiki.pdf
    • https://cdn.sqhk.co/seworani/dge6ghK/71038504110.pdf
    • https://fugowekarulosom.weebly.com/uploads/1/3/4/7/134700114/9028588.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mujevubutukoxu/wefas.pdf
    • https://s3.amazonaws.com/boxalewijim/33942550366.pdf
    • https://s3.amazonaws.com/gizonukorad/albumizer_7._4_free.pdf
    • https://s3.amazonaws.com/lekizopiloref/oxford_dictionary_app_apk.pdf
    • https://s3.amazonaws.com/gorajikunobixi/buffalo_bills_injury_report_week_14.pdf
    • http://gofudawaropuz.epizy.com/accurate_weather_app_android_free.pdf
    • https://s3.amazonaws.com/vovuzize/used_computer_parts_store_las_vegas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39d.bin
d76aaa7760a7fa500a0ea5ceda234391e2daea4ad33f06ba95ffcb9e266082f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 5352 bytes
font_01_sfnt_off0000f5ba.bin
043a141463fc2154b9cd65b40ed4c0c4b69e257ba94321261aba94a3f84c6d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 12392 bytes

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