Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a373f98b681e13…

MALICIOUS

PDF

79.5 KB Created: 2021-03-21 03:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16d064f98bf054092e40ced14f717e98 SHA-1: 2cd737811d189fe7f779ca64bc34c7dd0c5aa91d SHA-256: 50a373f98b681e1348b177251654dfcb95f4078932cff9637447c16cd7539e1b
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to attract traffic. The primary URL, 'https://jacksth.ru/wix?keyword=clash+of+clans+apk+free+download+apkpure', indicates a lure related to downloading an application. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/wix?keyword=clash+of+clans+apk+free+download+apkpure
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/dudamirodaxemidetajo.pdf
    • http://mijolek.iblogger.org/why_is_the_clean_light_blinking_on_my_dishwasher.pdf
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/a7c3c80ebd6.pdf
    • https://bupefozatige.weebly.com/uploads/1/3/4/3/134384552/6234844.pdf
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/2e7293e0a2e78b0.pdf
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/2836156.pdf
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/tovuvujoderijizi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kopivenegi.epizy.com/16434461971.pdf
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_865f0668048b4cbf978cff3c5ce324c9.pdf?index=true
    • http://vefofiben.rf.gd/69472170786.pdf
    • https://s3.amazonaws.com/tosevud/82059115086.pdf
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_8492ae6106da49b99463ad6df617ae3d.pdf?index=true
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_7729eed33a604fc493e5819442cc8384.pdf?index=true
    • https://s3.amazonaws.com/devuxuzejozam/miporodimomerifesa.pdf
    • https://uploads.strikinglycdn.com/files/323b6415-141e-4ab0-84c6-099748526546/brother_hl-2270dw_drum_and_error_light.pdf
    • https://uploads.strikinglycdn.com/files/03b92f4b-3304-4e2c-9fbb-0a389225c768/drawing_standard_bs_8888.pdf
    • http://lopotenunuguw.rf.gd/gipevinodigomun.pdf
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_d74deec62153417fa4998e94ee54702f.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_3575fa2dc42f4da0a0c54f1a41f8d37c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3756ae9c-3857-4e7f-b578-d7ace98bb5cc/rubipotirede.pdf
    • https://s3.amazonaws.com/gifiz/suwirirasedu.pdf
    • https://s3.amazonaws.com/mivokozibu/amazon_prime_location.pdf
    • http://jinuritubamo.rf.gd/nirenufura.pdf
    • https://s3.amazonaws.com/sajezife/ibm_lotus_notes_email_template.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df72.bin
80e553b0337e0f503374388746c823e4c835e521e1fbdd3b3cf7d38e7792ab91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 5304 bytes
font_01_sfnt_off0000f187.bin
9536fd44d2faf44e6ad985b0cad3b6839479ee544300d7198839dfb68fbc0711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 11900 bytes
font_02_sfnt_off000118f2.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 16204 bytes

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