Malicious PDF — malware analysis report

Static analysis result for SHA-256 da38ca05f15bda33…

MALICIOUS

PDF

81.1 KB Created: 2021-03-12 06:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3c4a73f350e6000519b79986bd194a8f SHA-1: 6a5758d285dd464f009469974a2b54189103ffe9 SHA-256: da38ca05f15bda33c81a061e46dbbdf5b76e39a20f86bb9621a66388c5e621ec
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a prominent one pointing to 'leonvi.ru', suggesting a lure to a malicious site. The PDF structure and embedded content indicate it's designed to trick users into visiting this URL, likely for credential harvesting or further malware delivery.

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 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://leonvi.ru/123?utm_term=avery+templates+for+mac+18660 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476420/normal_60304d0503b0a.pdfIn PDF document text
    • http://vedice.ru/magnesium_alloy_properties5n189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_601b7aab26c3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_602986d8d5f84.pdfIn PDF document text
    • https://gokuveseloniku.weebly.com/uploads/1/3/5/3/135309313/7224442.pdfIn PDF document text
    • http://medway24.com/gaggia_brera_spare_partskey3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_600ea3291b05e.pdfIn PDF document text
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/603364fdb35c6.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/1368311.pdfIn PDF document text
    • http://dashcamtopbest.com/zugosuluw2vm.pdfIn PDF document text
    • http://ygrash.website/8429548751695et7.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/gisarala.pdfIn PDF document text
    • https://nepejudakolop.weebly.com/uploads/1/3/4/8/134876169/2314228.pdfIn PDF document text
    • https://vixixufabajuwe.weebly.com/uploads/1/3/1/1/131163632/sevagiz.pdfIn PDF document text
    • http://damvglaz1.xyz/hp_officejet_pro_8600_plus_ink_cartridge_access_doorcscdm.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/buriwivewe_bijarojagimiwi_niwuzosazib_xanajuvefetod.pdfIn PDF document text
    • http://verifybadgesbusiness.com/84877446736d9r8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_6001496491097.pdfIn PDF document text
    • http://www.opentle.orgIn 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/71f01b46-89ca-4548-81ba-554155fd5fc0/nikijuvutigipupogurugoviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6456bff-e381-44ad-ab05-9e6ded9badf3/rowenta_precision_valet_1550w_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe65468-888f-47f3-ac50-b1a26b382e08/fojerapuxolexoxeveba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39daeba-157f-48ac-9f87-8fe8f68d8ac2/2989115647.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e9a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE9A9 14804 bytes
SHA-256: bbb69724bd213c3d02bc93629c4250614519bd16026db6582ab67fd613acdb55
font_00_sfnt_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 5856 bytes
SHA-256: 4bd052ae82a978d2a84234382a9242321ceecbe1ded8901493fb8bf2332851a5
font_02_sfnt_off00011261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 10000 bytes
SHA-256: d1a10cd8962535313bd381f441d4817ec9aeaaff45b8d7774c10053e33f65b27