Malicious PDF — malware analysis report

Static analysis result for SHA-256 1816411799f55ae4…

MALICIOUS

PDF

79.2 KB Created: 2021-04-04 22:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 495637b6ac936f1f6ccd1a9a8a1f3e60 SHA-1: cc1e879910fcf4102e6d45d68ce1bde7ea33f6b5 SHA-256: 1816411799f55ae4dec7563743da53e4e95452940f5341f496184b3c0d04aaee
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/aws?utm_term=navy+seals+training+center+coronado PDF link annotation
    • https://cdn.sqhk.co/kominepoli/Xhjlhgj/gazokuru.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/Dlhbavn/eartha_kitt_i_want_to_be_evil.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/6830023.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/swift_analysis_aptitude_test_answers.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/larozapekomare-daxamawufiliden.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/9768708.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/jggehcc/archery_shooting_glove_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/X39ThiS/mezurop.pdfIn PDF document text
    • https://cdn.sqhk.co/sururezog/HN4hdgg/zombie_gunner_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/ihcc0N2/kafamomobaxebawalegure.pdfIn PDF document text
    • https://xorizetevapaze.weebly.com/uploads/1/3/1/4/131438163/5960499.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/IhjhbMy/learn_kivy_python.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/gekitekuvuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/QgdZfii/how_to_draw_cartoon_lips_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/jeZKxgc/devil_girl_bad_girl_cute_gacha_life_wallpaper.pdfIn PDF document text
    • http://wofotejijuwulap.iblogger.org/conair_clipper_guard_size_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawatutosewo.epizy.com/vivonuxowetofibep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6163e0-206c-4773-87cc-18e06a63f7ad/23098654591.pdfIn PDF document text
    • http://pajupevezujugut.atwebpages.com/gakususerituri.pdfIn PDF document text
    • http://bevavotubuzepu.rf.gd/fleetwood_rv_battery_wiring.pdfIn PDF document text
    • http://jukujomufo.rf.gd/50604932642.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/77848604198.pdfIn PDF document text
    • http://duvowukuvemilo.epizy.com/sony_sacs9_10-inch_active_subwoofer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd343bcb-489c-4f0b-a71f-8c214e48b0fc/63426617714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc18dae-2e89-4977-82c1-baba5e44e57d/kamejuroliwuv.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_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 5236 bytes
SHA-256: 8037d2e8e9c87e1ae870d262b6b2b869066bff2c01e488f92852b4fdd6361276
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 11160 bytes
SHA-256: dd3484d982520d4fd1743171d224a46b6460cde46f899fed16196bdd4ef4ae31