Malicious PDF — malware analysis report

Static analysis result for SHA-256 543c8f62a6b15119…

MALICIOUS

PDF

73.8 KB Created: 2021-03-09 09:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5692048d2186daaed039b2fae6b46aff SHA-1: 562ba008a3fb489181e12b4de232eb9d8716d3aa SHA-256: 543c8f62a6b151192c5c8e93e44014689aa01b6883a7bc31e8c6f3418508ae51
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to lure users to malicious sites, likely for phishing or malware distribution.

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
  • 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 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.
  • 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://dafemum.ru/123?utm_term=classifying+quadrilaterals+worksheet+3rd+grade In PDF document text
    • http://peludofnor.fun/29884785641d5fn6.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/38961697387.pdfIn PDF document text
    • http://jekigun.22web.org/happy_birthday_song_free_for_iphone.pdfIn PDF document text
    • http://folejaf.mypressonline.com/sutosubetofoxegagomopan.pdfIn PDF document text
    • http://samudexifogiva.22web.org/fezilaro.pdfIn PDF document text
    • http://naturaitalia.space/44114598016fo5ix.pdfIn PDF document text
    • http://euroshopme.site/kousalya_supraja_rama_mp3_song_free_downloadq60fy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesunamugebo.epizy.com/bofivekafugas.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/nosalobagakejosegakowok.pdfIn PDF document text
    • http://zenulasomizin.epizy.com/72028209332.pdfIn PDF document text
    • http://piwakolipa.rf.gd/do_termites_have_long_antennae.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_4365c930bb5742bdaa9d28325035710e.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_1360f981c5ce4da4a273ac9915fae89f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/cisco_networking_academy_exam_answers_chapter_5.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/dasejokuzolixeloxiz.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_049c5e0378024614814b2ed64fd77901.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/50169243476.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/64501449340.pdfIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_9d03cb307cb74098a00f4319fa3acd0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/peburojoxurobudimemuzumi.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_4f04b3de6c17481cb2efc542eb9aae27.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 5624 bytes
SHA-256: 0d11010f2e89f8c2f794379b11467e73f1a783cffd9f3d7b6eeb03bfc1396d57
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 10748 bytes
SHA-256: e8c5416721190c6f76896f23fc8d7fa0198d2387285185381154abf9a348b5d7

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