Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a89da1aa09bff3…

MALICIOUS

PDF

94.0 KB Created: 2021-03-22 14:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1147d5818b161e6a26f8f29554a8a719 SHA-1: b32078d43b1ba4c4d890e2e4262c129a9e78c18a SHA-256: e9a89da1aa09bff35c2ed8b1aecab6b83173f46ed3ca98d9a0042d94332e8521
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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/wix?keyword=bubble+witch+3+saga+mod+apk+rexdl PDF link annotation
    • http://byseles.xyz/13645873387vqe8f.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/rqnjhdo/tedev.pdfIn PDF document text
    • http://yachts-4-sale.com/jixaguvuvanfui67.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/xaxekexano.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/ibji5IV/74256730387.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/6088238542hekxu.pdfIn PDF document text
    • https://dulebolipema.weebly.com/uploads/1/3/5/9/135997598/1142e94feb0.pdfIn PDF document text
    • http://resimpub.com/pidupunesei3681.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/ANhiie2/custom_car_shifter_knobs.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/pogojapozemi-falowu-kopeb-buwuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_21956af51c2a4f8e8041592c3948c2f9.pdf?index=trueIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_ee90e06b69524612b07736aaab89a32f.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_5c7ebdff269a4d2198a7ee37a930a8b1.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_a85bb1c50c284b3cb959037e08d06d40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/php_database_driven_website_tutorial.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_d82fb8ad521e49509f0d0d2e2746e2d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/suvajavuzuvip.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/jevarilizutalamew.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_cfbfcc6106c2477db24adbcbd08ef495.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/nokizesaw.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/google_play_store_pending_issue.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_be76dac9d75e47a4a68500c0ceff7deb.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_aa4616666e4a446cb16050a8d2ddbf8f.pdf?index=trueIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_c962e95b02384c4ab9efca3fd3c6b8de.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 2880 bytes
SHA-256: 80960c5ef920dc812f40421d0c41ad5272b60f71c1256c1bdf7a11afd8d5b2df
font_01_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 6064 bytes
SHA-256: b7e434c6f4a6ace7f505d29f183f19a11e647527eb8efaca3533c02c3e64ce96
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 3024 bytes
SHA-256: cf5ed4f450e5fc1fa31c8ac31b5dbd05637a4ba05cdfa332ae769b600578e534
font_03_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 13004 bytes
SHA-256: 48f4e5e7b43f7d02af3791e4360992d214df0325c7d612346f3287d65116e442
font_04_sfnt_off00015291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15291 16132 bytes
SHA-256: 29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146

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