Malicious PDF — malware analysis report

Static analysis result for SHA-256 f289a9c4eaacb6a4…

MALICIOUS

PDF

71.1 KB Created: 2021-04-02 17:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89ddc9f0f2eed8fdde2bb10157084d77 SHA-1: 7744a5a7a9682730891c1df49f36cb7b2295e9c3 SHA-256: f289a9c4eaacb6a4c403c85bed4bc959b3767effbc86e4f594e067ed3ddddc3c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains numerous external links, including a link farm heuristic. One of the primary URLs, 'https://kuzutuzo.ru/wix?keyword=motion+worksheet+answers', and a linked PDF from 'http://kidiwutimako.mygamesonline.org/feduranenitetiju.pdf' are suspicious. The document body, though heavily obfuscated, suggests a lure related to 'motion worksheet answers'.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=motion+worksheet+answers
    • http://kidiwutimako.mygamesonline.org/feduranenitetiju.pdf
    • http://50offit.pro/xiburakusatiwatikavaribwjqo6.pdf
    • http://vovality.club/simple_recovery_model_vs_full_recovery_modelc3hyh.pdf
    • http://moscowflowers.shop/125751710379108a.pdf
    • http://motorutovibipe.sportsontheweb.net/beethoven_sonata_16_imslp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejenijovekozu/92041957541.pdf
    • https://s3.amazonaws.com/ravuxudibure/bsl_shaders_1._14_4.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_d27e329b78ac4e52af3051aa8b5f6372.pdf?index=true
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_bc4adb2043c749878bd73ab56a3a104e.pdf?index=true
    • https://s3.amazonaws.com/wapabefizosumi/blackberry_bold_9900_flash_file.pdf
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_26b5667706e5481ba31fb78098aaf46f.pdf?index=true
    • https://s3.amazonaws.com/jupudizadid/how_much_do_window_cleaners_make_uk.pdf
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_48f6f92e9db541d3bdbc9939171d0730.pdf?index=true
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_16458768ceb5446a94695941cda98bb1.pdf?index=true
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_e70c261f00804b8aa1e06bc506a10526.pdf?index=true
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_a86a7bc53199431cb282e09363f69fb1.pdf?index=true
    • https://s3.amazonaws.com/rumezo/11385590162.pdf
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_103ceec537c945ddb9c06350f7ded9bc.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_5887b7e7b3a84541a7599e187bc5d030.pdf?index=true
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_59cb5bbe5db249f5854d409a87e90019.pdf?index=true
    • 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_off0000d950.bin
c8eec29617c2642a8536c566f4786ed8d15221e95f2f0cc7349eec5c79d1370f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 4904 bytes
font_01_sfnt_off0000ea12.bin
1b849cd5a7c16fb2534404c12a1c2258072389dbf4aaaec15d665447f1fe8c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 11012 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.