Malicious PDF — malware analysis report

Static analysis result for SHA-256 999fe6e01f755673…

MALICIOUS

PDF

77.0 KB Created: 2021-03-23 02:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4caf03bc2eda7209023021fb36c7c46f SHA-1: 51f47d1a8262935ebf92ccb87a0ed60611f79cfa SHA-256: 999fe6e01f755673508b760799e1956d7832df84365f91b9a3350db68a3921bd
266 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing or social engineering attack. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The document also includes social engineering lures, specifically instructing the user to copy and paste content into a terminal (e.g., Win+R, PowerShell, cmd), a technique often used to bypass macro restrictions and execute secondary payloads. While no scripts were directly extracted, the presence of these lures and the link farm strongly indicates an intent to trick the user into executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://zajinet.ru/aws?utm_term=premiere+pro+2020+keyboard+shortcuts+pdf PDF link annotation
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/97224bbe583.pdfIn PDF document text
    • https://cdn.sqhk.co/tifatuju/eChjfGD/13954326981.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/hfhjpeN/wopokurufof.pdfIn PDF document text
    • https://wofiwajelakezod.weebly.com/uploads/1/3/6/0/136092853/b7cf6687ba.pdfIn PDF document text
    • https://zadilomevesijob.weebly.com/uploads/1/3/4/5/134581884/830700.pdfIn PDF document text
    • https://cdn.sqhk.co/dilipokoje/xieel6Q/good_food_guide_best_chocolate_brownies.pdfIn 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/236f82c0-4e2a-4dcc-8af6-8f91efae0b50/84923757774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06df949-43ba-4006-ad39-8e8cb747b05f/95637168728.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_2f5b5bb3bda449519367a83e83933f17.pdf?index=trueIn PDF document text
    • http://dujibagakag.epizy.com/does_chicago_citation_use_footnotes.pdfIn PDF document text
    • http://ladobuvop.epizy.com/kitchenaid_stand_mixer_cover_ksmct1.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_157ba769aa4c4e199e6166971cfbc75f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0830cd09-e282-4633-ac08-1191e83204da/how_to_describe_timbre_of_music.pdfIn PDF document text
    • http://vijelovisisojo.rf.gd/turitizazifojetixejimuril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec99da1c-fb7f-435e-a253-027a61baa505/tenelezofumanisufi.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_0a0187a2b4474e34b94bf0c986c25263.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemupajese/bach_violin_partita_2_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/chintakayala_ravi_full_movie_720p.pdfIn PDF document text
    • http://lamumabazekutum.epizy.com/59667724492.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_1238bd7f757c4a39a122a1176c1a239f.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 5944 bytes
SHA-256: 5115bccf67d42633e0db49d6b5602a30b43a76fec47ecc359a97009592bad9e2
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 11060 bytes
SHA-256: a415282c7bf324a108de46bbe71d8b34bda857e8f8e866c3edde6810be63c8e6

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