Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d476b0d00c3c87…

MALICIOUS

PDF

99.0 KB Created: 2021-03-08 15:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fbc948a167749aa09e5e36529a9f5c75 SHA-1: 9d6337822a84631636cbf0f5a1506c3a69c19f75 SHA-256: e6d476b0d00c3c87333e6df4da1e814f638fbed10580f20a7e2884368905e19f
176 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. It uses a callback-phone (TOAD) lure. 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 0.9990

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/strik?utm_term=asus+rt-ac66u+dd-wrt PDF link annotation
    • https://cdn.sqhk.co/fowifabibu/hbLTUuo/missing_persons_search_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/hccFTKS/bad_piggies_hd_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/daEqDCG/38763883761.pdfIn PDF document text
    • https://cdn.sqhk.co/vurifozi/a2jhbOo/60204159787.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/FecXyig/95117075422.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/game_naruto_shippuden_petualangan_apk.pdfIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_c7d02b9f0d294526bc2ba36c348e738d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/21196289920.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/sedogune.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/what_are_the_benefits_of_an_evaluation_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/amityville_the_awakening_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/business_english_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/89895024149.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/avancemos_2_reteaching_and_practice_answers.pdfIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_8a6cf25deb1243adbb36c754632d9678.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_570668ae1b09488496c9287529daf224.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/2941338649.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/54856564731.pdfIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00016223.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16223 8084 bytes
SHA-256: f48816b1075c3e2b4c4db2682408651861a282d8ec49d98e192341fb52757028
font_00_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 5168 bytes
SHA-256: 4066eb27ef963ad4e08e56ae65c067e01429e9e61e8cbbb59b07633563bf57b9
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 2144 bytes
SHA-256: 04e8d6eb7840346664249f8c1b50e81f8677381d46f49ad100365bc02b08c7c7
font_03_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 12268 bytes
SHA-256: 9ddc855283bccd5ae3e06aa51a6ec16cff242310b177e0e9586f74bdd6940536
font_04_sfnt_off00014a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A99 16880 bytes
SHA-256: 6ec229c24529a358c131ee313581d0f07f65b4fe3555c9b3ede32f1fcfcfb813