Malicious PDF — malware analysis report

Static analysis result for SHA-256 8454958193e1f567…

MALICIOUS

PDF

73.4 KB Created: 2021-03-09 08:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 439e0ddc7f5d4769889af49b06954f68 SHA-1: 0689031056eeb07d4349f360ad21347ddebf2087 SHA-256: 8454958193e1f567bb39dde2bb4c564af9fdd429e58f3d24647b8e5d2095c6cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or redirection mechanism, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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/award?keyword=apgar+score+chart+pdf PDF link annotation
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/janumesa.pdfIn PDF document text
    • https://cdn.sqhk.co/kigakikijebo/ghn0FxP/zombie_smash_roadkill_mod_apk.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/fazudagaforelaj.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/rubomofowanexifire.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/ezgo_parts_san_antonio.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/vobamojevaw.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/bukalos-vafudutob-zarur.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/hcjcWhg/apple_wallpaper_hd_download_cave.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/vonesawizoga.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/hbjdij2/mewovojerol.pdfIn PDF document text
    • https://jikowizovogowo.weebly.com/uploads/1/3/2/6/132682153/7916203.pdfIn PDF document text
    • https://vafeperaj.weebly.com/uploads/1/3/4/5/134586379/zugasagowuxavixoj.pdfIn PDF document text
    • https://bafijesepuj.weebly.com/uploads/1/3/4/0/134041147/mijimipukas_noputevira.pdfIn PDF document text
    • https://cdn.sqhk.co/zanewijepex/xjihc9D/suzabena.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/9a4hc2b/hill_climb_racing_download_apk_free.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/mesixadelomomo/31365703571.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/61273404070.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/animals_cartoon_video.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/gelezuwivewuse.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/lotus_notes_client_9.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/paxiwerutuputi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 5372 bytes
SHA-256: 42fed2b784d3590cad596402391adbdd0fe8e11f1687f5aa047cda8fce4ae145
font_01_sfnt_off0000f4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 10568 bytes
SHA-256: e816f631638655aa6698b1fb75176ae0be780ac865456fe7d1c30410016d38c5

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