Malicious PDF — malware analysis report

Static analysis result for SHA-256 55aaa075943c9edc…

MALICIOUS

PDF

83.7 KB Created: 2021-03-11 13:07:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e343b7df63c176322f79985e9d90f76c SHA-1: d58e272c43710d5e4d7894d0fbc31be8f783b30e SHA-256: 55aaa075943c9edc54ce03fde07c9aa3d78eb89bb1af19891dada27bbf6f9fc6
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to downloading PDF writers, likely a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://resalured.ru/award?keyword=acrobat+pdf+writer+download+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369640/normal_6004567c9223c.pdfIn PDF document text
    • https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/b2dd1ef23.pdfIn PDF document text
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/63589a44c436f1.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/gajafajexogedosuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5fcc02f2ca304.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/hjijhja/alkahraba_fixed_bill.pdfIn PDF document text
    • https://sedawuxel.weebly.com/uploads/1/3/5/3/135326539/sanojezolokarov-jojorofikabaje.pdfIn PDF document text
    • http://igcopyrightclient.com/tadegalunotuzijaparegulivqsubs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_602ba88c0b833.pdfIn PDF document text
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/6a2e575.pdfIn PDF document text
    • http://workbykoder.xyz/merodawijisivopawfhp3w.pdfIn PDF document text
    • https://cdn.sqhk.co/buzulexoxuve/jjjkthd/20849227867.pdfIn PDF document text
    • http://winoraama.space/flammable_cabinet_regulationsdcd4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/how_to_use_onenote_effectively.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16f0e59-14ea-4c92-ac6f-85e35c3fa0a6/sodulazamiwega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eab00cb-15c1-4efa-a62b-43585e740f9f/grohe_kitchen_faucets_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fc5565-dea1-4655-8483-181e25ae126f/7966913332.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/adobe_animate_size.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/interest_groups_icivics_answers_the_potato_problem.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 5236 bytes
SHA-256: 87d1599e4a9317cf9e03835c4be478facab5f796f90df3d7b5602c53d8fef45e
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 5192 bytes
SHA-256: f490a802fa2e24f82477881587d8fff89f402b33d531eb054afe7f5cd992e5ef
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 10136 bytes
SHA-256: c7fdda750db3560e8a5ea9ff59e5905f092cfa68bad7938286589c8b17214cfd
font_03_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16488 bytes
SHA-256: 1d240a0535f2140f7c954fae970985d54487e451ba4ee00a2f6f8a8e98c285da