Malicious PDF — malware analysis report

Static analysis result for SHA-256 931b7082914e55d3…

MALICIOUS

PDF

80.9 KB Created: 2021-04-27 10:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d2d5bb0758469f380341676c030e7422 SHA-1: 04ed4efcbbe39c07be58c45221073f45c3e45643 SHA-256: 931b7082914e55d3284f8d8f36519774b62caa79611546acb285fb17d7b2de32
252 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical finding for a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'Blue iris apple tv' and authoring application details, suggesting a lure. The presence of numerous external links, many pointing to disposable hosting and some to known malicious redirectors, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=blue+iris+apple+tv In PDF document text
    • https://jutegejedexugak.weebly.com/uploads/1/3/5/3/135384922/gagibanufis-wofuligo-zoguveseropojo-surupizos.pdfIn PDF document text
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/9e0e7b1080.pdfIn PDF document text
    • https://ditoramaw.weebly.com/uploads/1/3/4/7/134724618/povitibo.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/idhajbe/police_siren_light_and_sound_simulator_pro.pdfIn PDF document text
    • http://car-den.ru/corian_worktop_manufacturers60dyr.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/h0iRB3o/14183271026.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/jgichas/1459997834.pdfIn PDF document text
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/bibakuxifonimom.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/XIJ1jeW/64183866531.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/VjgvMjb/free_mobile_phone_wallpapers_and_themes.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/36883341380winhk.pdfIn PDF document text
    • http://xeeewq.xyz/boy_scout_book_202099pzz.pdfIn PDF document text
    • http://100naturals.fun/28008488583429dw.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/idsicqx/vidabowigupu.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/rifhixK/ferik.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/hNkLM79/derudowusulixafa.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
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_f2f47f0c439f42f5ac24dcc62c061b04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezetega/global_marketing_internships_summer_2020.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_6164c63b7a734ae89d14a438bcdc0feb.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_d04ecf937771490a99c9fbb4e9abafea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/7524543078.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_510a2df09b1b437db601a77895f52877.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kufazete/32237036251.pdfIn PDF document text
    • https://4fd7ac12-06e8-439c-96a9-7636004ccb32.filesusr.com/ugd/9554ab_ef4a84d5189a472faf998ad1e993b629.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 4588 bytes
SHA-256: 9d34e3dc553879145a6e8d6cd967c34981ce7a8431fe0dcabf46d1909800b0ec
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 11316 bytes
SHA-256: 7d1a7dd3de9e03507f63526752f691b9027cdeafc08219764445fd634e59b1e0
font_02_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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