Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fac58c861163f41…

MALICIOUS

PDF

76.4 KB Created: 2021-05-03 06:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 459b4f2a6cb1ed406d4e788a54f47856 SHA-1: 15c259e7b3427aad7eb3dbf141123d6536b16867 SHA-256: 8fac58c861163f41453b4eb6866087a7c7f5e69ecd206736255bacb88d4c35a8
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 0.9995

Heuristics 5

  • 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.
  • 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/strik?utm_term=hp+officejet+4622+printer+for+sale PDF link annotation
    • https://cdn.sqhk.co/tokokoxisuf/ZjGifia/kukezelexote.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/dhcjieS/entity_a_horror_escape.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/7rvjhhb/sushi_neko_las_vegas_50_off.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/lFjIjbn/jususijifarebimap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_8a3fbce412a04bf3b97df3b3329276be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c88093c-ffe2-4f1d-a15c-f3a600147183/beveramivotolanaweku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e619fe-145f-4e0a-a4d8-aecca264f952/kuvezepamopiropapunezowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52911c7e-ea1a-4fed-b702-01071ac8b5aa/donarozawevaduvujad.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_eb67671a9e3a42b2a0ffbddc430c3dff.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_e67e206cacae4d709ec477b000ad9e8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a61e24-d217-4ddb-9544-b6096fb33378/15281377323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae1d64a-c12a-4cf2-bf59-b8751b06580d/spyder_imagine_select_paintball_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef169be-c531-430c-a223-5a64360ac567/vegan_diets_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff84ca7-84bc-467a-8451-9fc43d8edeb6/20213345724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0251f817-a7a7-44d1-88f9-1d0a080a0f15/23910786079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242f7527-7ed2-4204-9c0e-bc964da51790/tidogumigoworakitojexa.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_c4ed1b5661d64272b2cd97435ab6180e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/041ac185-a539-4f11-8443-bcc108cfd768/minn_kota_mk330pc_3_bank_on-board_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfff09f-05da-4f0f-bc43-d72737741a3b/17677593518.pdfIn PDF document text
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_4129fe38a4af46eb8333d9c0d2ed245a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5c9f1d-89c5-4a12-9aad-760f010951e2/best_pack_and_play_mattress_pad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c05b6a-415f-45ee-9f8c-caa86d61db71/10519362299.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 5420 bytes
SHA-256: 46279b8c07ea98fe469051e144e0326dc902b740f5c87abf09c2aef503909529
font_01_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 10240 bytes
SHA-256: 0196a2291c96061e1eb3eb69a00d6db6940817503afedc9995096d7abfb9b2c9