Malicious PDF — malware analysis report

Static analysis result for SHA-256 5becb8c06f0322f3…

MALICIOUS

PDF

80.8 KB Created: 2021-05-28 11:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 887205670cfce93c1e2ec1cdc90f0bd8 SHA-1: 1eca3ac9d6f31460a74e543779eee481654e55fa SHA-256: 5becb8c06f0322f351723b026ee596cb985add193ec7ed4f3c6b19bc832f300a
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The presence of multiple 'unknown' reputation URLs, including those hosted on weebly.com, further supports this. The ClamAV detection and ML classifier also indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=samsung+galaxy+tab+a7+10.4+32gb+with+wi-fi+%2528gray%2529
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/895bd8c.pdf
    • https://lajibomigijiku.weebly.com/uploads/1/3/4/5/134587714/15218b9.pdf
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/tizukoweguma-tezov-saxegizunuk-xutuxam.pdf
    • https://gepufefodu.weebly.com/uploads/1/3/4/0/134013389/rofitasapo.pdf
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/lexun.pdf
    • https://wafubimuzev.weebly.com/uploads/1/3/4/8/134869603/c8bce93a.pdf
    • https://podosutopo.weebly.com/uploads/1/3/4/5/134590637/32142b29fda0f.pdf
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/4473022.pdf
    • https://tenifapinam.weebly.com/uploads/1/3/4/7/134711228/2274664.pdf
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/8753569.pdf
    • https://mekuzawejonoma.weebly.com/uploads/1/3/1/6/131606345/rejogapebi.pdf
    • https://vogitoroxubas.weebly.com/uploads/1/3/0/7/130739894/9610546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3fc2973f-447d-4128-883d-138962059bc4/pivuposesizirelagutovu.pdf
    • https://uploads.strikinglycdn.com/files/1630e64c-8731-408e-b0d4-63c86b3ffa69/veroraxag.pdf
    • https://uploads.strikinglycdn.com/files/77a94036-0df8-42b7-b199-b389d82c1f5f/official_gre_quantitative_reasoning_practice_questions_3rd_edition.pdf
    • https://uploads.strikinglycdn.com/files/1da61f13-40bd-4912-8369-c4c24c3a9866/inkheart_book_summary_in_chapters.pdf
    • https://uploads.strikinglycdn.com/files/04249ccb-4972-4b10-8a9d-869f9057ba1e/the_book_of_nod_free_download.pdf
    • https://uploads.strikinglycdn.com/files/f6df5059-f84c-4370-8660-0d6ddde80c87/67492598215.pdf
    • https://uploads.strikinglycdn.com/files/71d37d00-f386-4e25-84d0-464315ae9ccb/editor_de_tarjetas_de_presentacion_gratis_en_espaol.pdf
    • https://uploads.strikinglycdn.com/files/6d9359c9-8dfe-4667-85f0-510bac1f8262/forotoso.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa31.bin
0bd2b3ea6c859e92409f41be5dc209fd0567300e02bb130e5846d4dc410ebbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 6564 bytes
font_01_sfnt_off000110a6.bin
4e0fe1999ba4c16cdf197c086040c080e4fa61c15482e847209dcc2b63537e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 10876 bytes

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