Malicious PDF — malware analysis report

Static analysis result for SHA-256 0897d57739c04f35…

MALICIOUS

PDF

80.2 KB Created: 2021-03-06 09:26:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d3364487f096f67ce5cef89b8b755b76 SHA-1: 7741b39b06c8dc4c5e28943f0c87b6c32b2c95f7 SHA-256: 0897d57739c04f35c4461ec4f083eae8520c1ca131862dad81e5c0cafd01f666
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure for downloading an Android application, likely malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=conker+bad+fur+day+apk+android+download In PDF document text
    • https://fivixevovisobav.weebly.com/uploads/1/3/1/3/131380347/bbd4e.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/hiiLHMM/9236419085.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/vibumep.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/which_domain_is_best.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/muGphbZ/god_of_stickman_3_hack_2019.pdfIn PDF document text
    • https://vunusamonumated.weebly.com/uploads/1/3/4/0/134040658/463612.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/zetabanekubujax.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/349488992.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/7579862377.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/bigot.pdfIn PDF document text
    • https://gokatejasefe.weebly.com/uploads/1/3/4/6/134650338/d144920a2b5f.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/dizazumerodemop_bararewabupa.pdfIn PDF document text
    • https://cdn.sqhk.co/nafadurip/NKhbhbi/mod_emerald_items_apk.pdfIn PDF document text
    • http://pevisokis.iblogger.org/kia_cadenza_2013_manual.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/remawenud-zopinekomag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0725327b-a623-4cb4-9ce2-5ebee1eb5412/mopunuvewikemiworiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a35eea-fff3-4a29-933c-ada3e4dd1e86/mafadipeperixedufuzowek.pdfIn PDF document text
    • http://limixumijegaf.epizy.com/significado_de_caliciforme.pdfIn PDF document text
    • http://kowexefuwuron.rf.gd/archery_game_java.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/16187933033.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 5160 bytes
SHA-256: 8a0901e554faee37ad3afe9137a78842e3b5c00d4c8d6c92c7169d313adfb9f7
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 10016 bytes
SHA-256: 79d8e079ef595b77be31080b9951d26f184a10bd35d42f11345b40ca74f077ea
font_02_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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