Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ee582c4317eb96…

MALICIOUS

PDF

92.3 KB Created: 2021-03-23 14:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d18f7650eb971732e76a46368556f0c SHA-1: e5a0391d32c7443c4e621ba9fbf8f3b48a6f7113 SHA-256: f5ee582c4317eb965af53c2f2059924ebe5d6019d62af9db9f995877602371c4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results or manuals. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/wix?keyword=quincy+qt-54+installation+manual
    • http://hrushch.space/defensive_driving_course_ny_answers77ksk.pdf
    • https://cdn.sqhk.co/dinigivo/UBMgjhd/65518604027.pdf
    • https://nonedavoxezi.weebly.com/uploads/1/3/5/9/135956696/65cf59b3fa8c45.pdf
    • https://zutupowetor.weebly.com/uploads/1/3/5/3/135350992/jigawavezesara.pdf
    • https://jarowezib.weebly.com/uploads/1/3/0/8/130813985/4b7003329d18.pdf
    • https://winojarenegesut.weebly.com/uploads/1/3/4/4/134481716/21314e894.pdf
    • https://cdn.sqhk.co/vumuwuxa/QjiiiFS/download_fanatical_basketball.pdf
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/makigozud.pdf
    • http://raftgjgr.space/fz_bike_imagesha171.pdf
    • https://cdn.sqhk.co/kominepoli/hiEBThg/download_door_slammers_1_mod_apk.pdf
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/3497368.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/gupinov_lakebarasi_kuwivipujiruxu_famobiluler.pdf
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/godibinadov_sazotub.pdf
    • https://cdn.sqhk.co/vugujebeku/exjcibr/friends_tv_show_wallpaper_download.pdf
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/puxumito-tudalidobuvek-juvowexifewukug-sazebaroto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kelukakeb/61857306626.pdf
    • http://dukidejulorib.epizy.com/87959390071.pdf
    • http://tifijawubizomed.epizy.com/avision_button_manager_v1.pdf
    • https://s3.amazonaws.com/xutomoxu/60_day_notice_to_vacate_template_georgia.pdf
    • http://bifakafuwal.rf.gd/how_do_you_fix_a_dehumidifier_sensor.pdf
    • http://sopigovo.rf.gd/megewaziratafisapexe.pdf
    • https://s3.amazonaws.com/muxozuvalubi/62722790070.pdf
    • https://s3.amazonaws.com/bulikowexunepov/28892242511.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e3a.bin
c64e0a4309e17f0e93d3491c8c274694131546c3097c4573b96891f5dc5dd545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 5148 bytes
font_01_sfnt_off00012fc2.bin
ef83666f941d208a5bed7d881f789a3b6352ddc04638cbf89ff41861f0cfa36b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 10972 bytes
font_02_sfnt_off00015521.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15521 4324 bytes

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