Malicious PDF — malware analysis report

Static analysis result for SHA-256 4822c1fb938edbbb…

MALICIOUS

PDF

77.9 KB Created: 2021-04-02 11:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4ad903fd1f2b21569fe9eebb03daa2d0 SHA-1: 6b9162c5197ea42cd20fb79283366131037ca725 SHA-256: 4822c1fb938edbbb549e6fcf95e8b33638dabf1adecacf634f0b5d0cb3dee623
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic findings reveal a significant number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially malicious content or to engage in deceptive practices.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=biochemistry+laboratory+boyer+2nd+edition+pdf PDF link annotation
    • https://kenometiwu.weebly.com/uploads/1/3/4/3/134340836/zakuti.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/e9a102fce.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/1767376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6056f2818b3a1.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/Dhg5QTl/kill_the_creeper_game.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/gdxYjbf/63991073378.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/9CEeugj/netetesunub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_601f84486b455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_36ae8f532034477aac29651f9e8d2566.pdf?index=trueIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_2b625e2ececc49e9885645b7dba2d747.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_79320b0ac7bb43b59830c4ca00feee2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/17832703456.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_4ed9307e66fc4bdcbcde5d9bedb0e01e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/alfresco_community_edition_5._0.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/cartoon_pumpkin_carving_template.pdfIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_ff0d8e823a4f4ecfa005f6ff591b606c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/outlook_android_anmeldung_nicht_mglich.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/kafododiruketijepe.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/47106919390.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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 5816 bytes
SHA-256: 63eea76fc0e187052c046f6fb6090947dbeeb073e598e40e70e1eee017249d0f
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 11224 bytes
SHA-256: af3ca8a79b3537352dbc11c40e56a10f95d2cb8940fb26f9d41d73d65291f024

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