Malicious PDF — malware analysis report

Static analysis result for SHA-256 5667cd82ebf75f98…

MALICIOUS

PDF

97.6 KB Created: 2021-04-19 23:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7587e896b98a87c51156f6a627f91768 SHA-1: 58fff9d6c98d9051c55ffcb41a0ef7430c6942d6 SHA-256: 5667cd82ebf75f98702f691fdd7d682419b39beb30ff00aaf7161d3125aefac5
156 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 0.9990

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 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.
  • 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://gimoguvi.ru/strik?utm_term=important+english+grammar+topics PDF link annotation
    • http://eagleaff.com/can_child_support_increasegjylf.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/Ngehahd/80046250556.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/a6hbDgf/batokewosamajilizukam.pdfIn PDF document text
    • http://sexedate69.site/christmas_cake_decorated_with_candy_caneseqasg.pdfIn PDF document text
    • http://aicberg.net/snes_donkey_kong_country8zmay.pdfIn PDF document text
    • http://rte-ita.fun/gixedavodojw5n5.pdfIn PDF document text
    • http://mebets.xyz/devagiezcy6.pdfIn PDF document text
    • https://cdn.sqhk.co/mobubivifa/7YjeLgh/34811163326.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/cJjerid/pagezomelaxurog.pdfIn PDF document text
    • http://lg-copyright.com/why_wont_my_weber_grill_light5xsym.pdfIn PDF document text
    • http://itsamorem.com/live_nettv_apk_file_for_iphonebpqpa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mukutud/pigubamuz.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_f44e1a3d95f24ed798785000d67e5d80.pdf?index=trueIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_8e9037d5785a4d2cb82290c4b0772e80.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_20ab3d744626438ab96cef0c5607c5cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/79041444870.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/41012562490.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_0541c1d3daf14e9ea13cf0dd59a25ea7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/63051547803.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/catholic_answers_cruise.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/26499088151.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/zimavufepumurivesilol.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 5072 bytes
SHA-256: 4d9a11e4a1f8cc6935798bfb0e15e28552ab16b0f121519140b4a74b6786cffa
font_01_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 11908 bytes
SHA-256: 631bf4381e353d2fbc91d53efa640cb6538752edc4ab90fae1192fbe488ddba8
font_02_sfnt_off000154d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D9 16160 bytes
SHA-256: 53c3ec829963ec5a0af1bff4be2d724acb9959b277e5253d769434e6be684fe1
font_03_sfnt_off000169e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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