Malicious PDF — malware analysis report

Static analysis result for SHA-256 5239410499cb3cb0…

MALICIOUS

PDF

71.9 KB Created: 2021-05-13 22:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03ac6d1c61e81e21bd443d8dee0649d5 SHA-1: c3fcf5be757c2877c38eb578651dc2e9b4fe805b SHA-256: 5239410499cb3cb0433e5423c3f9d0e8d85387261283731f006c42a3853f29dc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with one prominent link pointing to 'vilenefex.ru' and another to 'canonsburglake.com', suggesting an attempt to redirect users to malicious websites. The document body, though partially corrupted, contains keywords related to 'boiler' setup, likely a lure to entice clicks on these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://vilenefex.ru/wb?keyword=how%20to%20start%20up%20a%20boiler PDF link annotation
    • http://canonsburglake.com/zoludadanixovotedilugafsb7.pdfIn PDF document text
    • http://alsamcctv.com/78795975436yxbtb.pdfIn PDF document text
    • http://a1metromovers.com/surfboard_sb6141_blinking_blue_lightsou7sk.pdfIn PDF document text
    • http://masalev.ru/depudufubaribofuweo0gzr.pdfIn PDF document text
    • http://mebets.xyz/32146938994mmsfn.pdfIn PDF document text
    • http://blognews.top/brian_mcknight_marry_your_daughterh6chz.pdfIn PDF document text
    • http://mnogoturov.com/after_world_war_ii_the_automobile0iwkh.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/tifa_fell_how_to_get_back_upt0veu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_0761748da5554d46937ac470ddc02314.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad11ce5a-49e0-4b18-8da1-a95baf439f20/how_much_does_it_cost_to_replace_a_refrigerator_compressor_uk.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_c024eeed005b43858f6cc3e7f1fc0fa9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc024b5-f560-4d31-82db-058d4ce1c5b7/80244688887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ee7b5e-b233-41d5-b326-ebd04d9cdf09/ripuzuxogogakodabures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799b55e8-38df-4689-8834-f51ff7583efd/51373189881.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_f4037036405c49249f3ff849132efecb.pdf?index=trueIn PDF document text
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_acf99430f53340ddb78bcbaa382936e4.pdf?index=trueIn PDF document text
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_89f01a592b374af496ad838ba07807f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4dbde5-3e29-4412-965e-7a99465257ab/vezozikosutufewor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b395f265-3355-4c18-b71a-b904ebbfc0b9/fefojema.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_8638d8af55a7497eba4acf97404e86c8.pdf?index=trueIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_fd524e88346a4af18cfd03bbfab06e9b.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_3c6be23f317e4ffdb441684760e88787.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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 5004 bytes
SHA-256: 5b424dfe7e062a21fab90a9c62697dfcf6292ccaee757312d07136a700a5a07d
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 10764 bytes
SHA-256: f703bb1698bf6a901232ff143ec9d3c4bd1f033161246f7bfe6eba7457fe70a6