Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda2bb1eefc8e2f7…

MALICIOUS

PDF

80.5 KB Created: 2021-03-11 10:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f482f9db80d3fa5637ec031284467d16 SHA-1: b2b7fb2049d5ab72e801ec821969247b4c4ca295 SHA-256: bda2bb1eefc8e2f74e9adf981a001c5c0b1a00df57d9e891324cb3ea0cd51e1a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to drive traffic to potentially malicious sites. The embedded URLs likely serve as lures for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jumiwimov.ru/award?keyword=buck+converter+design+demystified+pdf PDF link annotation
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/ec1a8.pdfIn PDF document text
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/wovenijozobo-guzavaripodaso-rotabime.pdfIn PDF document text
    • https://govalusazun.weebly.com/uploads/1/3/5/3/135325024/xefakunit_moserurij.pdfIn PDF document text
    • https://zuxaminuxux.weebly.com/uploads/1/3/4/6/134652083/vivuzalumilopimawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a5dd22-0c17-4ab0-909c-ca357d1d8e5a/gorup.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_bb4ba9c59e8f41c7b1cb177ad2c3d2ad.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_8e7d36de22ac4427adc113d622d2231f.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_fbfbf8d47e7d473d96ce4ecf02c0f806.pdf?index=trueIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_3c6e4c71a55a4a32b9d78773c7910bf6.pdf?index=trueIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_d8a05d2c2e0a41a8a68fc536c99758e7.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_a3156264608444b39c1249b9867ce53c.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_c06c4a8813124020ba9e411e2fc1df59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/75075586476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537c0275-8686-476a-8635-d5fef5659b16/89634529139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad15ecb-4a13-4c13-a954-4624880eb96a/paxinivomijizux.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_c79d46ba31bf481487d0da58722e54a6.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_61ddf64043784975b98681a57e6a1bfb.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_ff1ce7d2f86843f494c30f151add3fde.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_0686f9c6487b4dfcab712d614d96b63f.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_9b9a90c7ca444b6db44e9b8eab7a9c19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/nikulose.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_f35ad683494c4c999a80221eae45192a.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_a0b78b0127f647e6b3d95fcfcb2a00f7.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_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 5508 bytes
SHA-256: b36eace6f9fabdc7ddd59d87305346d24be123087f727b47c46011c862d7c8e6
font_01_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 10676 bytes
SHA-256: 44149e3cc28824432899bb74258ae661d30183f4c26367a1e57d594c0e1ab92f

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